Thanks for the reply. I don't have any codec packs installed, that's the thing. Wait...I guess the only thing that has changed recently is that I updated my ATI drivers....do you think that could be it?
Yeah, from what I'm seeing, it now appears on every .avi file. It'll skip for like half a second then resume playing. I can't seem to fathom why this is the case as it has never done anything like this before. I can't say for certain if it was before or after the ATI update, but I know that is probably the most significant change I've made to the computer recently.
I'll be reformating my computer soon, so I guess I won't be able to find out what caused it. If it's still there after the reformat + driver updates, I'm going to guess it's something to do with the latest driver.