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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[–] 17 points 7 months ago

You don't need C:\. All your data should be in the 365 cloud anyway. Storing files locally in C:\ leads to antipatterns like not paying Microsoft for 365 access (a.k.a "Software Piracy")

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