this post was submitted on 14 Mar 2026
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Microsoft Confirms Windows 11 Bug That Locks Users Out of the C: Drive (windowsreport.com)
submitted 2 weeks ago by throws_lemy@reddthat.com to c/technology@lemmy.world
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KB5077181 was released about a month ago as part of the February Patch Tuesday rollout. When the update first arrived, users reported a wide range of problems, including boot loops, login errors, and installation issues.

Microsoft has now acknowledged another problem linked to the same update. Some affected users see the message “C:\ is not accessible – Access denied” when trying to open the system drive.

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[–] luluberlue@lemmy.blahaj.zone 2 points 2 weeks ago

Hardly.

The system drive (very usually C:/) is where the Users folder lies by default (and you can't move it anyway IIRC), folder that contains stuff like the Appdata folder where... well... apps keeps their data like settings, history, backups... Most software will try to access it and would meet an "access denied" error.

This is also the default location for all the documents, music, videos, pictures,[...] folders (but you can change those though)

Basicaly you'd be limited to the "portable" versions of softwares located on other drives, which is not quite the norm on Windows.