Deselect Problem on Windows 7

I am running windows 7 everything is fine except every time I play a game or run something full screen it minimizes. If it is a windowed app like firefox it will deselect itself and I have to reclick it to select it. It is very annoying mainly when I am playing games antypign as i dont realise until its to late and have to re-enter all the text.
It was fine before installed 7 and i didnt have this problem.

Does this happen in IE?

yes,all programs

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