Lyne; Have you checked the health of your OS lately? And other apps? Infinite is far more interconnected to the OS, and things like blown application upgrades, and a dirty registry will bring it to its knees in all sorts of crazy ways. Hm. Vob is also an extension of a certain kind of video file....have you uninstalled any video players? Or updated them? A few weeks ago, I suddenly found Infinite simply would not initialize. After more experimentation than I like to do, I found the problem was a blown update of AnyDVD. No connection between the apps, save that they shared the same OS. I would start by looking at what processes you have running, and finding a website that defines the ones that -should- be running, and see what else is there. Something like the WildTangent web display driver can get into a system and wreak all sorts of issues, and digging it out is the proverbial pain in the ass. If the registry is healthy, take a look at your apps. If things worked before, then didn't, you may need to uninstall whatever you have installed between the times one at a time....and write down the sequence you do it in. Sometimes apps, just like drivers, need to be installed in a specific order to play nicely together...