Hi All, Well have an issue with a Vista User, during startup just after "welcome" appears an error message window is shown. Msconfig.dat has stopped working, windows will close the application and see if a solution is available... I have complete a clean startup by changing the config settings and it still appears, have run antivirus, malware and still have the came issue, ot does not appear during a save mode startup. So thinking of overwritting the msconfig.exe file with a new one from installtion cd. (after taking ownership ect..) Any ideas what it could be?