I suspected my ASUS laptop may have been compromised, so I reinstalled Windows 11 using the laptop's built-in recovery option rather than a USB installer. Afterward, Windows Security reported scanning hundreds of thousands of files—initially I worried it might be over a million, but the completed scan showed 557,261 files scanned. The system drive has about 141 GB free out of 236 GB, and both Windows Security and the Malicious Software Removal Tool reported that no malware was found. I also had trouble launching or locating the removal tool at first and manually downloaded it. Is this number of scanned files normal for a fresh Windows installation, and is there anything else I should check?
3 Answers
The main things to clarify are whether the files were merely scanned or actually flagged, which folders were involved, and how Windows was reinstalled. Since you used the laptop’s built-in recovery process and both Windows Security and the removal tool reported no malware, there is no obvious warning sign here. Having roughly 95 GB already used on a 236 GB drive can also be normal because of Windows, recovery files, updates, installed software, and personal data.
Yes, that number can be completely normal. A Windows installation includes a large number of system files, drivers, component-store files, recovery data, application files, and user-profile items. Antivirus tools may also inspect archives and multiple file locations, so the scan count can be much higher than expected. The important detail is that the scan completed without detecting malware.
The Malicious Software Removal Tool is separate from the regular Windows Security antivirus program. It may not appear as a normal installed application or as something you manage through the registry. Downloading it manually from Microsoft is generally fine, as long as you obtained it from Microsoft’s official website. Keep Windows updated and run an offline scan if you still suspect the machine was compromised.
That’s reassuring. The final scan reported 557,261 files and no threats, so it sounds like the count itself isn’t a problem.