This game card worked absolutely fine on my Windows 7. It is a great price for 60 days on a Fantasy RPG with HD graphics and endless ways to customize and develop your characters unique identity. ESO is certainly the next big thing in p2p RPG's and it will be for many years to come, thanks Bethesda!
P.S: I recommend if you're buying the game that you buy this with it. Above the reviews on this page is a combo deal containing both the game and game card that is cheaper than buying them seperately. The game itself comes with 30 days game time but requires a game time card or credit card to be redeemed.