Have posted this on the FS forum but it's pretty dead so thought I would try my luck here

Have been playing for about half an hour and it's getting really annoying. Every 20-30 seconds the game will freeze up for a few seconds then resume.
I'm running
Intel i5 3.2GHZ
Win 7 x64
4GB ram
GeForce gt545 1GB
I'm only using one monitor (a 32 inch tv), could the resolution be a problem? I have it 1280x720 so I can see my icons and stuff from the sofa lol.
Have tried changing all the options like graphic quality and the VRAM but its always the same
Help please!