Question 1

How do I run Disk Cleanup on Windows 11?

Accepted Answer

Press Start, type Disk Cleanup, and open the classic cleanmgr tool — or go to Settings → System → Storage → Temporary files. Tick Windows Update cleanup, Recycle Bin, and Temporary files, then delete. SysOverlay shows free space on the desktop so you know whether cleanup actually helped.

Question 2

What should I delete when the C: drive is full on Windows 11?

Accepted Answer

Start with Temporary files and Windows Update leftovers in Settings → Storage. Empty the Recycle Bin, uninstall unused apps and games, and move photos or videos off the system drive. Do not delete the Windows folder or random Program Files. SysOverlay warns when free space drops below about 15 GB but never deletes files from the cloud.

Question 3

Why is my Windows 11 disk full after I already cleaned it?

Accepted Answer

Update caches, hibernation (hiberfil.sys), restore points, OneDrive or iCloud folders, and game installers refill C: quickly. Check Storage breakdown after a week. A desktop disk reading — like SysOverlay’s free HUD — makes the refill obvious before updates fail again.

Windows 11 disk full — cleanup

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