Fixing or Repairing Windows Installation and Checking Disks for Errors

To fix or repair Windows (for example if problems with Microsoft Teams):

sfc /scannow

DISM.exe /Online /Cleanup-image /Restorehealth


To check disks for bad clusters on C drive, and try to fix:

chkdsk /x/r  c:

tips:
- you should always back up your data, just in case.
- all media are subject to 'bit rot' over time, including optical media.
- consider holding data on a separate partition from the operating system.
- consider backing up to an offsite target.
- consider backing up the 'raw' original files, so that they are easy to restore.

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