Yes, if you are sure there is nothing in windows.old that you will want.
1. Click Start
2. Select All Programs
3. Select Accessories
4. Click System Tools
5. Pick Disc Cleanup
6. Select Files from all users on this computer
7. Confirm the UAC
8. Select the drive that contains your old installation
9. One of the options will be to delete your old installation. Select it
and let the Disc Cleanup Utility do its thing.
Malke
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Elephant Boy Computers
www.elephantboycomputers.com
"Don't Panic!"
MS-MVP Windows - Shell/User