Is World of Warcraft available in 64 bit mode? My old game was vista, and now I have Windows 7.
I have Windows 7 64-bit, and I run WoW, Curse and Vent with no issues. Your system should work just fine.
I realize this is a bit oldish, but according to the GMs here (http://us.battle.net/wow/en/forum/topic/4488638967), the 64 bit client should be up and running.