When you update to Vista SP1 the installer saves backups of your system files in case you want to uninstall. If you’re like me, you have no plans to roll back SP1 at this point.
Microsoft has Conveniently included an SP1 Cleanup tool with the SP1 installer. This utility removes the backup drivers and system files from your hard drive.
On a 32bit system the utility can be found under
%SystemRoot%\System32\vsp1cln.exe
I’m not sure if there is an X64 version.
For me this utility freed up about 0.8 GB, but I’ve heard that it can be much more depending on your system configuration. If you use it let us know how you did.
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