I haven’t installed any applications and although I had iTunes and Internet Explorer open at some of same times as Vegas, I’m quite confident those two would cause no problems since I’ve had the three open at the same time many many times before with no problems.
EDIT: Actually, looking at my list of programmes installed, it says I have Windows Silverlight – installed on the 5th however I don’t recall installing it. 😐
Could this be the problem? It was yesterday that the Vegas started having problems so it’s possible for the two to be linked…