For anyone that has already downloaded Vista SP1 (if you haven't, you can downlaod the RTM x64 and x86 versions here http://vistarewired.com/2008/02/07/... ) SP1 comes with a simple cleanup tool where you can recover the space used by your old, pre-SP1 system files. To accomplish this task, use the Vista Service Pack 1 Cleanup Tool, which is installed with the service pack. Click Start, and type " vsp1cln " in the Search box to located the cleanup file. Click the file to open a Command Prompt window, type y to confirm that you really want to remove those files, and press Enter. The removal process is quick and does not require a reboot. On an Vista x64 installation, users reclaimed 1.5GB of extra disk space. On an Vista x86 installation, users reclaimed 600mb of extra disk space disk space. Remember, though, this procedure is irrevocable, but if SP1 is working fine, then there is no need to have the archive files anymore.