How to Use the Vista SP1 Disk Cleanup Tool
InformationThis will show you how to run the Vista SP1 Cleanup tool to permanently remove the Vista RTM backed up files created during the installion of the Vista SP1 to gain more hard drive space.
WarningRunning the Windows Vista Service Pack 1 Disk Clean-up tool permanently removes the ability to uninstall the Vista SP1. Do not run this tool unless you have no plans of uninstalling the Vista SP1 and just want to save or regain hard drive space. The only option to remove the SP1 after using this tool is to do a clean install of Vista.
NoteThe Vista SP1 disk cleanup tool gave me back 1.6 GB on my hard drive. This amount will vary on each computer. To see how much space you recover, make a note of how much free space you have on the C:/ drive in Computer before and after you run the SP1 Cleanup Tool.
Here's How:
NOTE: If you installed Vista SP2, then you will need to use the Vista SP2 Disk Cleanup tool instead. The SP1 Disk Cleanup tool will no longer work after installing SP2.
1. Open a elevated command prompt.
2. In the elevated command prompt, type vsp1cln.exe and then press Enter. (See screenshot below)
3. Type Y when you see Would you like to continue? and press Enter.
NOTE: Tying N will cancel running the Vista SP1 disk cleanup tool. You can also just close the command prompt window to cancel to.
4. It will take a little bit to finish. When it is finished, you will see the Windows Vista Service Pack 1 Disk Clean-up completed message. (See screenshot above)
5. When it's done, you can close the elevated command prompt.
That's it,Shawn
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Maybe I just keep a cleaner house. LOL 
Yeah, that's it. 
