Hi, Can anyone tell me where SP1 logs to regarding why it fails to install when a system has been vlited? From google etc I believe it is the CBS log? Mine appears to be about 50MB so may take a while to open and search. I didn't remove much, if anything from this system but it fails. UAC is on and I haven't set any services to disabled (probably some to manual though). thanks for any help Andy Last_Session.ini