There is a program out there on Kazza called all codec. Do a search for it and install on your system. It is about 24meg in size but its a rare day I find a movie that I can't play anymore. I think you need to be online to do the install to. It will also search your HD during the install for any worms or viruses that would otherwise comprimise your system. That portion of the install can take quite a while. The bigger the HD the longer it takes pressuming the HDs are filled up pretty good. Took forever on my system. 160 gig.
Hope that helps.
