Windows 7: Would these games work on windows 7??

Hi guys,
I am about to buy a desktop with windows 7 professional 64-bit english as the O/S. All i am wanting to know is will the XP mode that you can get for windows 7 be able to play these games that are meant for XP.

-Rail simulator

-Call of duty

-GTA IV

-Flight simulator X

I just need to know this, as i dont want to go out, buy a computer and the games, and they dont work.

If possible, someone that has windows 7 professional with the XP mode and either of the games on the list, can you post back wether they work or not. If they dont, i guess im gonna have to downgrade to XP!

Cheers