This was a mistake on my roomates part, I wouldn't have let him do it. but last night he got mcafee virus scan and he installed it without uninstalling norton, normally it would tell you that you need to uninstall any other scanners (especially norton) well he says it didn't. my roomate went through the whole install process, restarted, and now his computer will grind to a halt when mcafee is trying to load. Safe mode doesn't work , no boot discs work either. He is currently reinstalling windows. Neither Norton or Mcafee will say a single word about each other.

-Why do these AV scanners have to have that much control over the system to make it crash when they're installed on top of each other?
-Has anyone else had this happen? What did you do?