A Free Mount And Blade Activation Code Will These Games Run On A Microsoft Windows XP Media Center Edition 2005?

Will these games run on a Microsoft Windows XP Media Center Edition 2005? - a free mount and blade activation code

I have 2 GB of RAM, but I am aware of other components. Can these games for a reasonable accommodation, without totally frying my CPU?

Oblivion
Halo 2
Spore
Fallout 3
Demigod
The Orange Box
Company of Heroes: Opposing Fronts
Assassin's Creed
Braid
BattleForge
Free Realms
Silent Storm
Mount and Blade
Neverwinter Nights
Warhammer
Mass Effect
Everquest: Gates of Discord

And if one of those you recommend or not recommend, they say.