A lot of times when I play anything that takes up the whole screen, vista will alt tab on its own and minimize whatever I was playing. It does this while watching a movie on VLC too, only instead of alt tabbing, the Taskbar will just show... I turned off the always show the toolbar option in the options. It still hasn't fixed it. This issue is very annoying, and I have yet to find anywhere that it has been brought up. Please hallllp!