[airman]

Not related to your problem but how were you running IE 6 when Vista comes with IE7 plus the make, model of system would help amount of ram installed etc. See if you can start in safe mode and find out if it driver related. Have you installed any thing new in the last week or so. See if you can get the exact error message. If you could get into the advanced setting under startup and recovery, you can remove the check automatically restart on errors and then you could get to see the error code. You could also look in the event viewer to see if any problems are listed or the reliability and performance logs if you are able to get on to the system. Check the other thing crabby suggested also and you will get your problem figured out