Hey, my humble 2 cents. I had the "Buffer Overrun" error as well on my 2k,XP, and Vista machines. I deleted C:\Documents and Settings\$CurrentUser\Local Settings\Application Data\Apple Computer, then deleted C:\Documents and Settings\All Users\Application Data\Apple Computer, and when I tried starting up Quicktime, it said some stuff about reinstalling. While it was doing that, I deleted the contents of C:\WINDOWS\system32\QuickTime. Now I'm sitting pretty watching BMWFilms. 😀