Windows Vista SP1 Clean Up Tool
Vista SP1 is a BIG update, and it does not remove any of the files it replaces. This is because Vista SP1 allows you to uninstall Vista SP1, and rollback to your previous version of Vista. Unless you are Chuck Norris, I have a feeling you aren’t going to even consider this. So why not reclaim this 800+ megabytes worth of hard drive space?
Go to the command prompt, and simply enter the following: vsp1cln.exe.
Here’s the official Microsoft TechNet documentation:
Windows Vista SP1 File Removal tool (Vsp1cln.exe). 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 can use this tool both online and offline, but you must have SP1 installed and you must use the correct version of the tool. If you are running this file on an offline image, you should use the Vsp1cln.exe included in the Windows OPK or AIK. However, if you are running this file online (on a computer that you are booted into), you should use the Vsp1cln.exe file located at %windir%\system32\vsp1cln.exe.
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