Windows 8/10: Recovering Disk Space After Upgrade
When upgrading from Windows 7 to Windows 8.x, or Windows 10, the upgrade places a backup of the previous operating system in C:\Windows.old. If the upgrade was successful and there is no expectation a rollback is required, and if space is a premium (for example on SSD drives), this folder can be removed using Disk Cleanup.
- Choose Clean up System Files:
- Tick Previous Windows Installation(s) and Temporary Windows Installation Files:
- When prompted about being unable to revert to the previous operating system, choose OK.
To perform this manually (for highly technical users only):
- Open an elevated command prompt.
cd /d C:\Windows.old
takeown /f *.* /a /r
cacls *.* /t /g Everyone:F /c
attrib -r -s -h *.* /s /d
del *.* /s/q
- Use Windows Explorer to delete the remaining files.