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How to Clean Windows.old (Previous Windows Installation)
🟢 100% Safe to Delete
Typical Space Reclaimed: 15.0 GB – 35.0 GB
Location & Quick Verdict
C:\Windows.old
When Windows upgrades to a major new version or build, it saves a complete backup of your previous OS files in C:\Windows.old so you can roll back.
Safety confirmation: If your PC has been running smoothly for more than 10 days after an update, deleting Windows.old is completely safe and reclaims 20+ GB.
Manual Cleaning Instructions
- 1 Open Windows Settings > System > Storage.
- 2 Click on 'Temporary files'.
- 3 Check 'Previous Windows installation(s)' and click 'Remove files'.
Clean Windows.old (Previous Windows Installation) Automatically
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