The screen goes white for me a lot when I swap tabs. It's not a major problem - it's usually just that your browser is busy with the tab you were on, so when you swap back to RS it takes a while for it to work again. That file on your desktop is a Java crash file, it's just for diagnosing why Java crashed, but you don't really need to do that. Just delete the file, it's OK, you haven't got a major problem

On a side note, what browser are you using?
@King above: You said that used to happen to you when you used Vista and now you use Windows? Well, you were using Windows before. Vista's full name is
Windows Vista. You are probably now using Windows XP or 7.