seteffect problems

[everandom]

me and my friend comps are having problem with the seteffects and setcoloreffects, the screen will looks like a mesh( you know that mosquito thing) with the selected colour... why does this happen, while in my OZ comp. (in my OZ house) this doesn't occur and it works fine, so here i can't play in 2k1 coz of great lag caused by that and is there anyway to fix this thing coz my friend comp also have this problem...

thanx for listening to my problem