Windows 11 bug has locked a few customers out of the C: drive, Microsoft admits

An important Windows 11 bug has locked a few customers out of the C: drive, Microsoft admits - right here's what you can do if you're affected

There has been greater woe for decided on home windows eleven users over the past couple of days, with an unpleasant software worm locking a large number of people out of their primary C: drive. Microsoft has mentioned the trouble and is operating on a restoration.

As reported via Neowin and others, the Trojan horse triggers the message "C: is not accessible – get entry denied". It seems to have been introduced in the February 2026 safety update (KB5077181), and is predominantly affecting laptops manufactured by Samsung.

In its professional aid note, Microsoft indicates the problem is probably related to the Samsung proportion app, which is no longer shown at this stage. What is obvious is that it is incredibly difficult to get access to, and there are plenty of programs for affected users.

Workplace apps and internet browsers are the various applications that the main work reasons problems for, Microsoft. It says it's "presently investigating" the malicious program, together with Samsung, and will issue updates "whilst more data is available".

Documents, apps, and admin tasks

Neowin notes that only the contemporary home windows eleven variations 24H2 and 25H2 appear to be impacted by the bug, whilst according to Microsoft, more than one region is affected, such as Brazil, Portugal, Korea, and India.

If you've been hit by means of this computer virus, you may know about it: Microsoft says "getting access to files, launching packages, or performing administrative obligations" can trigger the error message, and for plenty users it's making their systems pretty an awful lot unusable.

There's the same old safety internet of an update rollback, which you may discover through the Settings > Windows Update menu — Microsoft has full instructions right here. As an alternative, if you have not mounted the February 2026 replacement yet, hit pause for now.

The enterprising folks posting on Reddit have a few guidelines about workarounds that involve converting ownership of the C: power, and at the same time, as this seems to have worked for a few customers, it is now not without dangers — so proceed with warning in case you do try those fixes.