If you can run the demo without many difficulties, will the actual game run the same as the demo?

pretty much ye, mayb a little better since they fixed some gfx issues in the patches

Here's a test you can take also, I recommend people taking this if they are unsure if they can run the game or if they want tips on what needs to be upgraded on their comp.

http://www.nzone.com/content/nzone/srl/nzone_srl.asp?gameid=5451