Vista SP1 File Removal Tool

What is Vsp1cln.exe (Vista SP1 File Removal Tool)?

Vsp1cln.exe is an optional tool that you can run after you install SP1. This tool removes older versions of components that have been updated in SP1, which are stored during the installation in case you need to uninstall SP1 later. Saving these older components increases the amount of disk space that is used. 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. Note, however, that you cannot uninstall SP1 after you run this tool.
You will get more free space on your computare after run this tool. You can read more about Vista SP1 File Removal Tool