Game Alt tabs to desktop when I finish connecting to a server

[ionuttzu]

It's pretty odd, never happened to me before I got a new computer and installed Win 7 on it (Note: on the old one I had XP)
So basically I log in, search for a server and start connecting. When it finishes connecting it immediately alt tabs to the desktop, so I still can get in-game and play after that. But it's getting goddamn annoying and I hope someone can give me a fix.

[thepalerider]

Run as admin not set in desktop shortcut on W7 PCs
Right click shortcut
choose 'run as admin' from list
Clicking on the Compatibility 'tab' for WINDOWS XP(service pack 2) isn't needed for W7.(shouldn't hurt ether)
Good luck - Welcome to the forums!