I have the final version of Windows 8 and I am trying to play Call of Duty 2 in it.

Problems:
When I join the game, I have to press ALT+TAB to go to the desktop and then to the game again so I can move my mouse in the game.
I cannot adjust the game brightness (gamma).
The mouse is laggy, weird movement in-game and in the game menu.

My PC specs: i5-3550/MSI Z77A-GD55/HD7850/8GB RAM/120GB SSD
ATi Drivers: 12.11 beta

Anyone has/had this problem? Fix?
It works just fine on Windows 7 under the same configuration and drivers.
The game is still played, needs to be fixed!