My knowledge of digital video is very rudimentary, so please forgive me if I'm just being dumb, but... I recently downloaded Virtualdub to play around with some videos I recorded with my digital camera. I wasn't able to open this particular video, however. I don't recall exactly what the error message was, but after poking around Google a bit, I found a site which suggested I "install the Panasonic VFW DV codec. It worked, and I was able to open my video in Virtualdub. A little later, however, I was trying to watch some other videos with Media Player Classic. I noticed that some of my AVIs won't play. They worked fine before, so I assume that, in messing around with the video codecs, I broke something. The affected files are all AVIs, as far as I can tell. Only some AVIs are affected, though. I was looking at the file properties and the common factor seems to be that the broken files all have MP3 audio. I seem to recall reading something about Virtualdub being unable to handle MP3 audio, but I don't care about that, I just want to watch them with Media Player Classic like I was able to do before. Any suggestions on what to do? I can't even figure out how to uninstall that "Panasonic" codec and revert things back to the way they were. Again, I don't really know what I'm doing, so any help at all is greatly appreciated. Thanks. EDIT: I forgot to mention a couple of things. MPC opens the AVI, and resizes the window as if it read the file okay, but the screen stays black and the "stop" button is highlighted. Pressing "play" does nothing. The files won't open in Windows Media Player, either. WMP gives me a "Windows Media Player encountered an unknown error." Thanks again for any help you have to offer.