I had an occasion to use SFC (syntax:- /scannow)with XP/service pack 2. This is what happened. After using it & restarting my computer I could not get past the start up screen,it just kept going in a start up loop,closing itself down & restarting again. I finished up having to do a COMPLETE recovery,just as well I had back up of all items. Is there a known problem with SFC /(scannow) ?????????? I am UN-willing to try it again because of the above reason. Baldy My Computer components are:- HP-Preserio -processor AMD 3200+ 1.9 ghz 1 meg ram am using AVG virus checker.Microsoft Office (full version)