After I lost my original Oblivion installation when an external hard drive failed, I reinstalled it on another external HD. Now when I try to launch the game the computer freezes when the initial Loading screen appears after the Bethesda intro screens. The loading progress bar doesn't advance, and I have to use the power button to shut down the computer. A reinstallation of Fallout 3 on the same HD works normally. The game was installed from the original Oblivion, KOTN and Shivering Isles discs, and the latest patches were applied. My original Oblivion folder in the My Games folder was preserved, as it is on an internal HD. I tried moving that folder to a backup location to cause a new Oblivion.ini to be created during game launch, but that had no effect on the freezing.