Viva Pinata for Windows (PC) stutters and laggy

http://forums.vivapinata.com/forums/thread/9692.aspx

In my case the problem was two-fold. Not only did I need the AMD chipset update for dual core processors with games, but my piece of crap Nvidia 7900GT was causing problems. I replaced the video card with a ATI 3870 and now Pinata runs great.