Chances are that you may loose a lot of space while you install Windows Service Pack 1 (SP1) or Windows Service Pack 2 (SP2), as you'll end up installing a lot of temp files during the process, which may not be necessary. The Windows Installer will unzip the installer files which are necessary for installation, but literally are not useful after the installing is … [Read more...] about How To Recover / Reclaim Lost Disk Space While Insatlling Vista SP1, SP2