For some reason, every once in a while when I'm playing a full-screen game in Windows 7, the game will minimize and focus will be given to the Desktop. I don't know what does this because no other problem appears to activate (nothing new in the taskbar or system tray appears).

This occurs in a variety of games, from a variety of publishers, so it's definitely not the game that's having the problem. When this occurs, I can simply click on the game to go back to it, but it's obviously still quite annoying.

Anyone know what's going on here? Is this a common occurrence with a simple fix? Thanks in advance!