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@killyourfm Turned off hibernation?

Admin CMD prompt:

POWERCFG /H OFF

Reboot. Run Disk Cleanup, tick all the boxes, let er rip. Then run it again, click "system files" and do the same again. It'll take much longer.

Run CHKDSK /F. Reboot again.

If that doesn't do it, then resize using Gparted from a Linux live medium, e.g. SystemRescue. Use Ventoy to format a multi boot key the easy way.