I recently switched to Windows 7 (Yeah, I know, where was my brain) and for some unknown reason windows explorer kept crashing every time I clicked on a huffy file. After a day of being pissed off I decided on a whim to uninstall FFDshow (I remembered it had given me trouble a few years back with not allowing things to display properly) and everything is fine now. Summary: If you run on Windows 7 DO NOT install FFDshow.
Hope this saved someone a few headaches. ^_^\/