Yes, forgot to mention bout that. I upgraded to 12.11 Catalyst then downloaded and installed latest BIOS from MSI. I also tried everything on LOW settings, still it happens. i also reinstalled Windows four times, Win7 64 bit, 32bit, XP 32 bit and 64 bit. All fresh and updated everything. Installed the game and still the lag happens.
Btw, thanks for the quick reply.