Internet Explorer is not my primary browser anymore but I do use it occasionally. Of course I installed IE 9. And it got me angry.
First it complained about open programs that are preventing installation progress. I think that it basically just listed all processes running at my computer. What Visual Studio has to do with IE installation is everybody's guess. And, of course, installation required restart. Why?
P.S. Once install is over, Internet Explorer 9 becomes pretty decent browser. It is quite similar to Chrome in philosophy and that is good thing.