I have a very annoying problem with tab switching in windows 7 ultimate x64. Sometimes, when i'm in a game and i try to switch to desktop or other window that i have opened (either with alt+tab or win+d), it switches for a second and then back to the game. Other times, it switches correctly from the game to desktop but when i try to switch back to game it doesn't work anymore. I reinstalled windows and the same thing happens.
I used the 32bits version until 5 or 6 month ago when i moved to x64 after upgrading my memory from 2gb to 4gb and i have to mention that the 32bits worked fine without manifesting this bug. Any ideas, anyone else having this issue ? Thanks.