sorry about the lame arse comment Ipcosmo , some people dont understand forums are here for questions to be asked and yours was quite reasonable. given alot of people are on limited bandwidth , downloading demos can eat that up fast.
as for you spook24 , if you havent got anything constructive to say then dont say anything , instead of trawling forums looking for people to flame , makes you the spammer not someone with a question you regard as 'novice'
as said you'll run those games fine at high settings depending on your operating system , if its vista then dx10 is a bit more demanding but still you'll see medium to high at 60fps np
all good games btw , enjoy them