same prob, totally different mobo. actually, it used to do it on my old mobo too, except only when using IE. With newer mobo it only ever does it in games. TBH i'd rather it screw up IE :s
seen a couple of threads on same thing pop up occasionally on here, noone has a clue what the problem is. I feel fairly sure it happened less with a diff keyboard i had, possibly because its one of those rubbish ones where you cant press crouch, strafe and reload at the same time :|