Alright, this is gonna take a little while to explain. Every once and a while both WMP and Quicktime inexplicably start acting up at the exact same moment. In the case of WMP when I try to play a wmv, be it in the browser or on my computer, I get the message: "This file may not play correctly because it was compressed by using a codec that is not supported". This can't be true because it could be the very same videos I played not 10 minutes ago before WMP and QT started acting up. Now what happens is the wmv plays normally, just without any sound. As for Quicktime with any mpeg, again in the browser or otherwise, the video has no sound and also stops frequently so that you have to keep clicking the tracking ball to restart it. Like I said, this happens out of nowhere to both WMP and QT at the same time, so that part is obviously not a coincidence. I have no idea why, what the problem is, or how to fix it. Strangely enough it seems to fix itself after about a week or so and then disappear, but it's happening frequently now. It's just started about two weeks again for probably the 3rd time, and went away for about a week, and now it's back tonight. This is insane. Very grateful if you can help.