Killer1nstinct

Sometimes, trees and houses will have a like, light blue stick through them in the game. Kind of hard to describe it, but its really annoying. My specs are below, pretty sure its video related, but not too sure what to adjust to fine tune it: 1.4gig Athlon TBird Prophet 4500 Kyro II 64meg video card Windows XP Pro. Thanks ahead of time to all who reply.