just delete them, because SP2 will include them. you can use the Reg Cleaner to clean them. yep, that's the only thing possible to have no archiving using SP2 to clear the steps using Windows XP SP2 without archiving (save around ~500 MB of disk space) do the following: Extract the service pack by using extract program or start the installation, check where is the folder which the SP2 extract the files copy to another location the I386 folder, cancel the original installation and continue: start with no archiving option: ../I386/Update/Update.exe /n restart windows after you finish installing the SP2 remove all the folders that start with $NtUninstallQ and $NtUninstallKB, from c:\windows and remove the same Q's and KB's from the registry under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows XP\SP2 HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\HotFix HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Management\ARPCache and also under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall in the above key you can also remove the uninstaller for the SP2 that shows under the Add/Remove programs RD