Windows is running low on disk space

Establish the scope

Identify the drive named in the warning and inspect Settings > System > Storage. Compare the space used by apps, temporary files, and personal folders before choosing cleanup. An update failing alongside low space does not reveal which category is responsible; check the update message separately for the space it needs.

Apply the safer fix first

Use Storage settings and Temporary files, or Cleanup recommendations where available, reading each category before deletion. Copy needed personal files to trusted storage and verify them before removing originals. Uninstall unused apps through Settings.

Investigate the cause

Configure Storage Sense deliberately. Never manually delete Windows, WinSxS, or unknown installer folders.

Protect the recovery path

Review Downloads, Recycle Bin, previous Windows installations, and other cleanup selections individually. Keep verified copies of needed files; removing a previous installation can remove a rollback option.

Verification

• Reopen Storage and confirm free space increased on the drive that issued the warning.
• Retry the original save or update operation, then check whether space rapidly disappears again; recurring growth needs its source identified.

When to stop

Do not continue with broader resets when the drive fills unexpectedly, reports errors, or important files lack backup. Preserve the observations already collected and use the device maker, network administrator, Microsoft support, a qualified repair technician, or data-recovery help according to the evidence.

Review the safe troubleshooting workflow before any broader recovery step.