I just did my update to Windows Vista RC2 build 5744 and because it was an update and not a clean install it created a "Windows.old" directory. Well, this folder is over 7 Gigs, and I can't really spare that much room for nothing. So, can I delete this folder and not cause any problems with my current Windows?
Solution: Yes, you can. If you want to remove that Windows.old folder from of your Windows Vista installation root drive, go to
Start > All Programs > Accessories > System Tools > Disk Cleanup
In "Which files to clean up" dialog > Click on "Files from all users on this computer".
Select the Drive where your Windows.old resides.
In Disk Cleanup dialog, select Previous Windows installation(s) in the "Files to delete" list. Click on OK.
This should clean up the hard disk space occupied by the Windows.old folder.
I verified this on Windows Vista x64.
Refer this.
