For some reason we can not log on to a Windows XP, sp3 laptop. This machine should be free of viruses, spyware, etc... as it was scanned extensively last week. But for some strange reason today it will not allow us to logon either in regular mode or Safe mode. It will boot to Windows in both modes and accept the logon credentials, but after accepting those credentials it will immediately logoff (before Windows loads) and go back to the WinXP Logon dialogue box. TIA for any help on this one ... e.