we are unable to watch DVDs on our PC. I get a error message saying that I dont have a decoder installed. I used to be able to listen/watch this dvd, but can no longer. My son said he upgraded to the newer version of WMP, so maybe this has something to do with my problems. If so is there anything I can do to fix my problem??? I have intervideo DVD 5, but when I was trying to uninstall it, to install it again, it doesnt show up on the add/remove window??? thanks in advance for your help sorry, I have intervideo WinDVD 5.