Windows Media Player broken

[theonezozo]

I had Windows Media Player 10 working properly, playing DivX AVIs beautifully. My roommate plugged in an external hard drive and ran BSPlayer off the HD to watch a subtitled movie (but didn't formally install it). Now he's taken his hard drive away and we can't play any AVIs in WMP (or any programs like Meedio that rely on it). WMV and MP3 files are unaffected.

AVI files are somehow registered to open with BSPlayer in Explorer, but double-clicking on them opens the Open With... dialog box.

Opening them in WMP gives me error C00D1199, which typically indicates codec trouble or "unsupported file type" but I have the proper codecs installed. To be sure, I reinstalled the DivX codec. And I can play these files in DivX player just fine.

I tried actually installing BSPlayer. I tried uninstalling it. I tried reinstalling Windows Media Player. All to no avail.

Does anyone have any ideas?

Thanks so much,
Mike


WMP version 10
BSPlayer Free 1.36
Video codec: DivX
Audio codec: MP3