This chapter covers Windows installation methods, a core topic in CompTIA A+ 220-1102 Domain 1.0 (Operating Systems). Expect 5-10% of exam questions to touch on installation types, media, boot methods, and post-installation tasks. Mastering these concepts is critical because the exam tests your ability to choose the right method for a given scenario, troubleshoot installation failures, and understand the differences between clean installs, upgrades, and migrations.
Jump to a section
Installing Windows is like building a house. You start with a foundation (the hardware), then choose a construction method: build from scratch (clean install) or renovate an existing structure (upgrade). A clean install is like demolishing an old house and pouring a new foundation—you get a fresh start with no leftover clutter or structural issues. An upgrade is like remodeling: you keep the existing walls and plumbing, but you might have hidden problems like outdated wiring or mold behind the drywall (incompatible drivers or software). Migration is like moving your furniture and belongings to a pre-built house—you transfer your stuff (user data and settings) to a new structure (different hardware or OS version). The installation media (USB, DVD, network) is your toolbox and materials. The boot process (UEFI/BIOS, bootloader) is the construction crew's first steps: checking the blueprints (firmware) and starting the work order (boot manager). The setup process (partitioning, file copy, configuration) is framing, wiring, and finishing. Like building a house, a clean install takes longer but avoids hidden defects, while an upgrade is faster but risky if the existing structure has problems.
What is Windows Installation?
Windows installation refers to the process of deploying the Windows operating system onto a computer's storage device. It involves copying system files, setting up boot configuration, installing drivers, and configuring user settings. The 220-1102 exam focuses on three primary methods: clean install, upgrade, and migration. Each has distinct use cases, requirements, and procedures.
Clean Install
A clean install places Windows on a blank or reformatted disk, erasing all existing data. This is the preferred method for a fresh start, especially when upgrading hardware or replacing a corrupted OS. The process involves:
Booting from installation media (USB, DVD, or network boot via PXE).
Partitioning the disk (using MBR or GPT — see below).
Formatting the partition (NTFS is required for system partitions).
Copying Windows source files (install.wim) to the disk.
Running the Windows setup wizard (OOBE — Out-of-Box Experience).
Key exam point: A clean install always requires a valid product key during setup, unless using a volume license or KMS. The installation media can be created using the Media Creation Tool (MCT) from Microsoft.
Upgrade Installation
An upgrade installs a newer version of Windows over an existing one, preserving applications, settings, and user files. The exam distinguishes between:
In-place upgrade: Running setup.exe from within Windows or booting from media and choosing "Upgrade." It keeps data, settings, and apps.
Repair installation (in-place upgrade with installation media): Used to fix system file corruption without losing data.
Important: Not all upgrades are supported. For example, Windows 10 can upgrade to Windows 11 only if hardware meets requirements (TPM 2.0, Secure Boot, CPU generation). The exam tests upgrade paths: Windows 8.1 can upgrade to Windows 10, but Windows 7 requires a clean install or a two-step upgrade (7 -> 8.1 -> 10).
Trap: Candidates often think upgrades are always possible. In reality, upgrading from 32-bit to 64-bit is not supported; a clean install is required. Also, upgrading from Windows 10 Home to Pro is possible via an in-place upgrade using a Pro product key.
Migration
Migration moves user data, settings, and applications from one OS or hardware to another. The exam covers:
User State Migration Tool (USMT): A command-line tool for large-scale deployments. It uses ScanState to capture data and LoadState to restore it.
Windows Easy Transfer: Available in Windows 7/8 but deprecated in Windows 10/11. Not tested as current.
Third-party tools: Like Laplink PCmover.
Exam focus: Understand that migration is not an OS installation method; it's a data transfer method. The OS must be installed separately (clean install or upgrade) before migrating data.
Installation Media Types
USB flash drive: Most common. Requires at least 8 GB for Windows 10/11. Created using MCT or third-party tools like Rufus.
DVD: Requires a DVD burner and media. ISO file can be burned using Windows Disc Image Burner.
Network boot (PXE): Used in enterprise environments. The computer boots from a network server that hosts the installation files. Requires a PXE-enabled NIC and DHCP/PXE server.
Recovery partition: Used for resetting or refreshing Windows, not for initial installation.
Boot Methods: UEFI vs. Legacy BIOS
The exam requires understanding the differences:
UEFI (Unified Extensible Firmware Interface): Modern firmware, supports GPT partitioning, Secure Boot, faster boot, and larger disks (>2 TB).
Legacy BIOS: Older firmware, uses MBR partitioning, limited to 2 TB boot disks, no Secure Boot.
Key exam values: - GPT (GUID Partition Table): Required for UEFI boot. Supports up to 128 partitions per disk. - MBR (Master Boot Record): Used by BIOS. Supports up to 4 primary partitions (or 3 primary + 1 extended).
Trap: A 64-bit Windows install requires UEFI and GPT if Secure Boot is enabled. 32-bit Windows can boot on UEFI with GPT, but the exam often tests that 64-bit Windows on UEFI requires GPT.
Installation Process Steps
Boot from media: Press a key (usually F12, Esc, or Del) to enter boot menu, select installation media.
Windows Setup loads: The Windows Preinstallation Environment (WinPE) loads.
Language, time, and keyboard selection.
Install now button.
Product key entry: Can be skipped; Windows will prompt later. Volume license keys may be embedded in the BIOS.
License terms acceptance.
Installation type: Custom (clean) or Upgrade.
Disk partitioning: For clean install, you can delete, format, or create partitions.
File copy and expansion: Windows copies install.wim to a temporary folder, then expands it.
First boot and OOBE: Configure region, account, privacy settings, and network.
Post-Installation Tasks
Activation: Windows must be activated within 30 days (grace period). Use a product key or digital license.
Driver installation: Critical for hardware functionality. Windows Update can provide many drivers.
Windows Update: Install latest patches.
User account creation: Local or Microsoft account.
Domain join: For enterprise environments.
Windows Editions and Installation Media
The exam tests that different editions (Home, Pro, Enterprise, Education) have different features and installation media. The same ISO can contain multiple editions; during setup, the edition is selected based on the product key entered.
Installation Troubleshooting
Common issues: - Insufficient disk space: Windows 10/11 requires at least 20-32 GB free. - Incompatible hardware: TPM 2.0 and Secure Boot required for Windows 11. - Corrupt installation media: Recreate using MCT. - Boot failure after install: Check boot order, UEFI/Legacy mode mismatch. - Driver issues: Use safe mode or recovery environment.
Command-Line Tools
diskpart: For advanced disk partitioning. Example: diskpart then list disk, select disk 0, clean, convert gpt.
bootrec: Fix boot issues. Commands: bootrec /fixmbr, bootrec /fixboot, bootrec /rebuildbcd.
bcdedit: Edit boot configuration data.
Summary of Key Differences
| Feature | Clean Install | Upgrade | Migration | |---------|--------------|---------|-----------| | Data retention | None | Apps, settings, files | Data only | | Time | Longer | Shorter | Variable | | Risk of issues | Low | Medium (compatibility) | Low | | Use case | New PC, corrupted OS | Same hardware, newer OS | New hardware, same OS |
1. Choose Installation Method
Determine whether to perform a clean install, upgrade, or migration based on the scenario. For a new PC or corrupted OS, choose clean install. For upgrading to a newer Windows version on the same hardware, choose upgrade. For moving to new hardware, choose migration (after clean install on new hardware). The exam will present scenarios like 'user wants to keep apps and settings' → upgrade, or 'replace hard drive' → clean install.
2. Prepare Installation Media
Create bootable USB or DVD using the Media Creation Tool (MCT) from Microsoft's website. Download the tool, select 'Create installation media for another PC,' choose language, edition, and architecture (64-bit or 32-bit). For USB, select 'USB flash drive' and choose a drive with at least 8 GB. For ISO, select 'ISO file' then burn to DVD. In enterprise, use PXE boot from a WDS server.
3. Boot from Media
Insert the installation media and restart the computer. Enter the boot menu (usually F12, Esc, F2, or Del) and select the media. Ensure the boot mode (UEFI or Legacy) matches the disk partition style. If the disk is GPT, boot in UEFI mode; if MBR, boot in Legacy mode. Mismatch causes 'Windows cannot be installed to this disk' error.
4. Partition and Format Disk
In the 'Where do you want to install Windows?' screen, you can delete existing partitions to create unallocated space, then create new partitions. For UEFI/GPT, Windows creates System Reserved (ESP), MSR, and primary partitions. For BIOS/MBR, it creates System Reserved and primary. Format the primary partition as NTFS. The setup will automatically create required partitions if you select unallocated space.
5. Complete OOBE and Post-Install
After file copy and reboot, Windows enters Out-of-Box Experience (OOBE). Select region, keyboard layout, and create a user account (Microsoft or local). Configure privacy settings and network. After desktop loads, install drivers, run Windows Update, activate Windows, and install applications. For domain-joined systems, join the domain after installation.
Enterprise Deployment: Imaging with MDT
In a large organization, IT deploys Windows to hundreds of PCs using Microsoft Deployment Toolkit (MDT) or System Center Configuration Manager (SCCM). Instead of installing each PC individually, they create a reference image (golden image) with the OS, drivers, and applications. The image is captured as a WIM file and deployed via network boot (PXE) or USB. This ensures consistency and saves time. Misconfiguration can cause driver conflicts or missing applications. For example, if the image includes a driver for a specific NIC, it may fail on different hardware. The solution is to use driver groups in MDT.
Retail Scenario: Clean Install for a Custom Build
A customer builds a gaming PC from scratch. The technician performs a clean install from a USB created with MCT. The motherboard uses UEFI, so the disk is GPT. During installation, the technician must enable Secure Boot and TPM in BIOS if Windows 11 is used. After install, they install GPU drivers from the manufacturer's website, not Windows Update, for best performance. Common mistake: forgetting to set boot order to UEFI first, causing boot failure.
Upgrade from Windows 10 to 11
An enterprise wants to upgrade existing Windows 10 Pro machines to Windows 11 Pro. They use an in-place upgrade via SCCM or Windows Update for Business. The key requirement is hardware compatibility: TPM 2.0, Secure Boot, and CPU generation (Intel 8th gen or AMD Ryzen 2000+). If a PC lacks TPM 2.0, the upgrade fails. IT may need to clean install or replace hardware. The upgrade preserves apps and settings, but some legacy apps may break. Testing in a pilot group is essential.
What the 220-1102 Tests
Objective 1.1: 'Identify common operating system installation methods.' The exam expects you to differentiate between clean install, upgrade, and migration, and know when to use each. Specific sub-objectives include:
Identify installation media types (USB, DVD, network, recovery partition).
Understand boot methods (UEFI vs. BIOS, GPT vs. MBR).
Know post-installation tasks (activation, updates, driver installation).
Understand upgrade paths (e.g., Windows 8.1 to 10, 10 to 11).
Recognize troubleshooting scenarios.
Common Wrong Answers
Choosing upgrade for a 32-bit to 64-bit transition: Candidates think upgrade preserves data, but architecture change requires clean install.
Selecting migration as an installation method: Migration transfers data only; the OS must be installed separately.
Believing Windows 7 can directly upgrade to 11: It cannot; requires clean install or two-step upgrade.
Using MBR for UEFI boot: MBR is for BIOS; UEFI requires GPT.
Exam Numbers and Values
Minimum USB size: 8 GB for Windows 10/11.
Activation grace period: 30 days.
Windows 11 hardware requirements: TPM 2.0, Secure Boot, 4 GB RAM, 64 GB storage, DirectX 12.
Partition styles: GPT (UEFI) supports up to 128 partitions; MBR (BIOS) supports 4 primary partitions.
Windows 10/11 system requirements: 1 GHz CPU, 2 GB RAM (64-bit), 20 GB free space.
Edge Cases
Upgrade from Windows 10 Home to Pro: Supported via in-place upgrade by entering a Pro product key.
Clean install without product key: Windows will run unactivated for 30 days; some features limited.
Repair installation: Uses upgrade method with installation media to fix system files without losing data.
How to Eliminate Wrong Answers
If a question mentions 'keeping applications and settings,' the answer is upgrade, not clean install. If it mentions 'moving to new hardware,' the answer is migration (after clean install). If it mentions 'corrupted OS,' the answer is clean install (or repair install if data retention is critical). Always check architecture (32-bit vs 64-bit) and hardware compatibility.
Clean install: erases data, fresh start; upgrade: preserves data, apps, settings; migration: transfers data only.
Windows 10/11 require at least 8 GB USB for installation media.
UEFI requires GPT partition style; legacy BIOS requires MBR.
Activation grace period is 30 days; use product key or digital license.
Windows 11 requires TPM 2.0, Secure Boot, and compatible CPU.
In-place upgrade cannot change from 32-bit to 64-bit; clean install required.
Post-installation tasks: activate, update, install drivers, join domain if needed.
These come up on the exam all the time. Here's how to tell them apart.
Clean Install
Erases all existing data on the target partition.
Requires reinstallation of all applications.
No risk of compatibility issues from old settings.
Takes longer due to full setup and app reinstall.
Ideal for new hardware or corrupted OS.
Upgrade
Preserves applications, settings, and user files.
Faster than clean install as no app reinstall needed.
Risk of compatibility issues with existing software/drivers.
Cannot change architecture (32-bit vs 64-bit).
Ideal for upgrading same hardware to newer Windows version.
Mistake
An upgrade can change from 32-bit to 64-bit Windows.
Correct
Upgrade preserves the same architecture. To switch from 32-bit to 64-bit, you must perform a clean install.
Mistake
Migration is an installation method for Windows.
Correct
Migration transfers user data and settings only. The OS must be installed separately via clean install or upgrade before migration.
Mistake
Windows 7 can directly upgrade to Windows 10 or 11.
Correct
Windows 7 can upgrade to Windows 10 only via a clean install or a two-step upgrade (7 -> 8.1 -> 10). Direct upgrade to Windows 11 is not supported.
Mistake
MBR is required for UEFI boot.
Correct
UEFI boot requires GPT partition style. MBR is used for legacy BIOS boot.
Mistake
A clean install always deletes all data.
Correct
A clean install formats the partition, erasing all data. However, if you install on a different partition, other partitions remain intact.
Reveal each answer, then mark whether you got it right. Score 60%+ to unlock the next chapter.
A clean install erases all data on the target partition and installs Windows fresh, requiring reinstallation of applications. An upgrade preserves existing applications, settings, and user files, installing the new OS over the old one. Choose clean install for new hardware or corrupted OS; choose upgrade to keep everything on the same hardware.
Yes, you can upgrade from Windows 10 Home to Pro in-place by entering a Pro product key. Go to Settings > Update & Security > Activation and select 'Change product key.' The upgrade keeps your files and apps.
At least 8 GB. The Windows 10/11 installation files require about 4-5 GB, but 8 GB is the recommended minimum to accommodate updates and additional drivers.
Boot from installation media, choose 'Repair your computer,' then go to Troubleshoot > Advanced options > Command Prompt. Use bootrec commands: bootrec /fixmbr, bootrec /fixboot, bootrec /rebuildbcd. Alternatively, use Startup Repair.
GPT (GUID Partition Table) is used with UEFI firmware, supports disks larger than 2 TB, and allows up to 128 primary partitions. MBR (Master Boot Record) is used with legacy BIOS, supports up to 2 TB and 4 primary partitions (or 3 primary + 1 extended).
No direct upgrade from Windows 7 to Windows 10 is supported. You must perform a clean install or upgrade to Windows 8.1 first, then to Windows 10. Alternatively, use a custom installation (clean install) that backs up data separately.
30 days. After installation, Windows runs in a trial mode. You must activate within 30 days, or the desktop will be black, and you'll receive periodic reminders. Activation can be done via product key or digital license.
You've just covered Windows Installation Methods — now see how well it sticks with free 220-1102 practice questions. Full explanations included, no account needed.
Done with this chapter?