Patched to the latest version?
Although it is a horrifically optimised game it does need a bit of power to max out but your system should should be fine..
Settings?
It's just an awful game for PC hardware. It will play smooth on some hardware with some tweaks but no guarantee. It plays smooth for me on a 570, but I still get the odd lag. Also a real chore to install if you don't have the steam version.
I don't understand this? Put disc one in and click install. Put disc 2 in when asked. Update and play?
PC version is the best version though. Smooth as silk on my rig in specs
Installed dead easy for me, like I said I don't understand the chore to install it.
The latest patch does not even use social club.
I know, I patched it and it wouldn't load the game for some reason...Thats what I rememeber as well, last patch even tells you social club is no longer needed when its installed if I remember.