Hopefully some of the microsoft gurus around here might have some idea about what's going on here. Several months ago, some of my AVI files just stopped working. When I try to play them in Winamp, Windows Media Player, TCMP, the BSPlayer, etc., they cause fatal errors which cause those programs to crash. Now, some of my AVIs will play - like, for example, AVIs I've created with Vegas Video , some episodes of Ghost in the Shell and stuff my little brother sends me (his video work from temple.) Other stuff I've downloaded just won't play. Now, I've updated my video driver several different ways - I tried running the files with the OLD ATI drivers, with the new software update and with both installed simultaneously - nothing. I've been reinstalling the latest version of winamp each time, although I don't think this causing/changing anything. I've also been regularly reinstalling the most recent version of Divx each time, thinking that might be the problem. There is SOME driver missing SOMEWHERE on my computer that MADE it capable, before, of reading pretty much any AVI file I loaded up. Now, it's been either replaced with some new phantom driver or it's become corrupt. I don't know what to do; I'd like to burn more video DVDs even THAT program won't recognize these files as valid AVI files. Anyone have any clue?