I do appreciate some peoples comments here and not others, I won't mention names. I'm far from an idiot. The reason I posted was because Vista was working fine, I had changed nothing. I had been playing CoD4 for a good few nights before last and now the whole things just gone **** up!
I just strange to me that it decided to mess me around now, when it was working fine. I made no changes, I've got SP1 installed. I'm going to do some troubleshooting later to see if I can dig up something. Like I said I appreciate the help you guys are giving me, I've also checked and my hardware is compatible.
I'll let you know how I get on.