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Fixing Boot Issues with System File Checker (SFC)

A user reports that their Windows 10 laptop takes an unusually long time to boot and frequently shows a 'Preparing Automatic Repair' screen before finally loading the desktop. Which Windows tool should be used first to diagnose and potentially fix the boot process?

Quick Answer

The answer is to run System File Checker (SFC) from an elevated Command Prompt. This is the correct first step because the slow boot and 'Preparing Automatic Repair' loop are classic symptoms of corrupted system files or a damaged Boot Configuration Data (BCD), and SFC is designed to scan and repair these protected files without risking data loss. On the CompTIA A+ Core 2 220-1202 exam, this scenario tests your ability to prioritize non-destructive troubleshooting—many students mistakenly jump to bootrec commands or a full reset, but SFC is the first-line tool for boot integrity issues. A common trap is forgetting that SFC requires an elevated prompt, not a standard one, and that it must be run from the Windows Recovery Environment if the system won't boot normally. Memory tip: think "SFC First" for system file corruption—if the boot loop is due to file damage, SFC is your safest and quickest fix.

⚠ Common exam trap

CompTIA often tests the misconception that Disk Cleanup or a full restore is the appropriate first step for boot issues, when in fact SFC is the correct initial diagnostic tool for file corruption without data loss.

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Run the System File Checker (SFC) from an elevated Command Prompt.

The 'Preparing Automatic Repair' loop and slow boot often indicate corruption in critical boot files, such as the Boot Configuration Data (BCD) or system files. Running System File Checker (SFC) from an elevated Command Prompt scans and repairs protected system files, addressing the root cause without data loss. This is the first-line diagnostic tool for boot integrity issues before escalating to more destructive methods.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✓

    Run the System File Checker (SFC) from an elevated Command Prompt.

    Why this is correct

    SFC scans and repairs corrupted system files, which can resolve boot delays and automatic repair loops.

  • ✗

    Perform a full system restore from a backup made last month.

    Why it's wrong here

    System restore is more drastic and not the first step; it may erase recent changes and is not targeted at file corruption.

  • ✗

    Use the Disk Cleanup tool to remove temporary files.

    Why it's wrong here

    Disk Cleanup frees space but does not address corrupted system files causing boot issues.

  • ✗

    Reinstall Windows using the 'Reset this PC' option.

    Why it's wrong here

    Reinstalling Windows via 'Reset this PC' performs a clean OS deployment, which erases boot-time diagnostic data and does not target the underlying cause of a corrupted boot configuration or failing driver that triggers 'Preparing Automatic Repair'. It is tempting because it guarantees a fresh system state, and would be correct if the user needed to resolve persistent malware or a deeply corrupted system hive that no repair tool could salvage.

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Same concept, more angles

1 more way this is tested on 220-1202

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A user reports that their Windows 10 laptop takes a very long time to boot and shows a 'Preparing Automatic Repair' message before eventually loading the desktop. They mention this started after a power outage. Which Windows tool should you use first to diagnose and attempt to fix the boot issue?

easy
  • A.System Restore
  • ✓ B.Startup Repair
  • C.Reset this PC
  • D.System File Checker (sfc /scannow)

Why B: Startup Repair (option B) is the correct first tool because the user reports a boot failure with 'Preparing Automatic Repair' after a power outage, which often corrupts critical boot configuration data (BCD) or the Master Boot Record (MBR). Startup Repair is designed to automatically diagnose and fix these specific boot-related issues without affecting user files, making it the most appropriate initial step.

JA

Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

This 220-1202 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1202 exam.