How to delete Windows.old in Windows 8 [duplicate]
Solution 1:
The Windows.old folder is a backup of the previous installed windows. It can be removed after some weeks when you think that all configurations are migrated correctly to Windows 8. See Microsoft statement
The folder can be removed with the Disk Cleanup (cleanmgr.exe) program, that can be found by typing "Disk Cleanup" in the Modern UI.
Choose Clean up System Files. Then check the Previous Windows installation(s), click OK and confirm with "Delete Files".
Then the folder should be removed.
