I have decided to clean my hard drive lately, here are some things I did:
Deleted the Vista SP1 installation files (they are only needed if you plan to remove SP1, which I don’t)
- Open cmd.exe with Administrators rights
- type “vsp1cln”
Disabled hibernate (this is desktop, don’t need it…)
- cmd.exe again
- type “powercfg -h off”
Got 10 GB back :)