Microsoft has blamed Samsung for some devices suffering C:\ drive access problems coincidentally close to March’s Patch Tuesday.

Users saw the message “C:\ is not accessible – Access denied” when trying to launch applications, including Office, browsers, and utilities such as Quick Assist.

An access denied error when trying to access the C:\ drive is certainly a bad day for Windows users. The C:\ drive is usually assigned to the first bootable disk partition and is where system files and applications are typically located.