What versions

being the model of consideration that i am, heres a quick list of patches youll need

unrealtournament 2004 (3355 recommended, but not need as ut is awesome)
+community bonus pack 1
+community bonus pack 2 (both parts)
+editors choice map pack
+'XP' bonus map pack

battlefield2 version 1.02

halflife2 - just update steam late friday night.

that should keep you covered.

oh and run windows update please. run it over and over till all the updates are applied!!