When I bought my current Oblivion PC, I was using a single-display ATI card and a non-wide LCD. I've since upgraded the video card and added a 24" widescreen LCD, but due to my desk layout, I run the 24" off to the side as a secondary display, usually for watching movies while working on the primary (non-wide) display. Oblivion is the only game I play on this PC, and I'd like to make use of the widescreen if possible, but I can't seem to find any way to bring it up on the secondary display. I can drag the initial Oblivion menu to the secondary display, but once the game actually launches, it reverts to the smaller primary.
This is on a Windows Vista Home Basic system, and the card is an Asus EAH4650. Any suggestions?