220-1102 Practice Question: That their computer is running slowly and they…

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 a quick format and then reinstall the OS.

  Why it's wrong here

  A quick format primarily removes the file system journaling and directory entries, making the space available for new data without physically overwriting all sectors. This method leaves the boot sector and other low-level disk areas untouched, which are prime locations for persistent malware like bootkits or rootkits to reside. Reinstalling the OS over a quick format would therefore risk reinfection from any malware still present in these unformatted regions, failing to resolve the underlying performance issue if it's malware-related.

• ✓

  Use a secure erase utility that overwrites the entire drive including the boot sector.

  Why this is correct

  A secure erase utility performs a low-level overwrite of the entire storage device, including the Master Boot Record (MBR) or GUID Partition Table (GPT), all partitions, and every data sector. This comprehensive process ensures that any persistent malware, such as bootkits or rootkits that embed themselves in the boot sector or unallocated space, is completely eradicated. By completely sanitizing the drive, it provides a clean slate for a fresh operating system installation, effectively eliminating the source of the reported slow performance if caused by deeply embedded malicious software.

• ✗

  Delete the encrypted files and run a registry cleaner.

  Why it's wrong here

  Deleting encrypted files, while potentially removing some data, does not address the presence of malware itself, especially if it's a bootkit or rootkit operating at a lower level. Furthermore, running a registry cleaner primarily targets orphaned or invalid entries within the Windows Registry, which might offer minor performance improvements but will not detect or remove active malicious code. Neither action impacts the boot sector or other critical system areas where persistent malware often hides, making this approach insufficient for resolving a potentially severe infection causing slow performance.

• ✗

  Use System Restore to revert to a previous state.

  Why it's wrong here

  System Restore is designed to revert system files, registry settings, and installed applications to a previous snapshot, which can sometimes resolve issues caused by recent software installations or configuration changes. However, it is not a comprehensive malware removal tool and often fails to detect or eliminate sophisticated malware, particularly bootkits or rootkits that infect the boot sector or operate outside the scope of the protected system files. Such deeply embedded threats would likely persist even after a System Restore, continuing to cause performance degradation.

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