The main reason for the sluggish frames is down to your Ram and Virtual Memory. I would recomend that you increase your ram and alter you VM to the max. The 2 gig hard drive in todays standards is a small HDD how much free disk space do you have? As that equally can slow the FPS (frames per sec) down to a crawl. You also state you upgraded your graphics card how much ram does it have? 8mb 16mb 32mb 64mb??