Users who download and install the service pack 1 for Windows Vista are most likely not reverting to the old state their computer was in unless something stops functioning properly due to the service pack installation. If everything turns out well you might like the following tip [found at Digital Inspiration] that cleans Windows Vista of old system files that are no longer needed because they have been replaced by newer versions.
The old files are kept in place just in case the user wants to revert back to the old system. The great thing about this tip is that Microsoft is providing the Windows Vista Cleanup Tool which is installed during service pack 1 installation.
The name of the file that you need to execute to cleanup Vista after the Service Pack 1 installation is vsp1cln.exe which is short for Vista Service Pack 1 Cleaner. Just execute it from the command line and select yes when you are asked if you want to continue. The old files will be removed from the system which frees some disk space.
The only drawback of this utility is that you cannot go back to Windows Vista pre Service Pack 1.
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Nice, it frees 800+MB disk space for me!