VSP1CLN Command-Line Options
The Windows Vista Service Pack 1 (SP1) Files Removal Tool (VSP1CLN.exe) can be used to remove the files that are archived after Windows Vista SP1 is applied. Running this tool is optional.
Installing Windows Vista SP1 increases the amount of disk space that is used by the operating system. This space is used to archive files so that SP1 can be uninstalled. Typically, you should run VSP1CLN.exe if you want to reclaim this disk space after applying SP1 and if you will not need to uninstall SP1.
“SP2 also includes a Service Pack Clean-up tool (Compcln.exe), which helps restore the hard disk space by permanently deleting the previous versions of the files (RTM and SP1) that are being serviced by SP2. The Pack Clean up tool can also be run offline while creating slipstream images to reduce the size of the image,” Microsoft informed.
In this context, Vista SP2 offers an evolved form of the Vsp1cln.exe tool, which was integrated into SP1, but is no longer a part of the second service pack for the operating system. However, the basic functionality has been successfully preserved. Namely, compcln.exe is designed to perform the same task as Vsp1cln.exe, that is making the installation of the Service Pack permanent, by deleting all components associated with previous releases, and in this manner removing the possibility of restoring a past state.
for vista add compcln and vsp1cln commands to remove superceded Vista updates
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