Ok, I uninstalled the Radeon driver, removed the card and rebooted. PC loaded in in very low resolution.
I tried loading the same set of games again.
Avernum 4 - loaded fine.
Etherlords 2 - same result, dos window - Etherlords 2 has closed.
Bastion - loaded up fine.
Endless Space - loaded up fine.
EDIT: After re-installing the video card and driver, I decided to try running one of the offending games, Endless Space, and it loaded up just fine.
I also tried Avernum and Bastion. Both of those loaded to a screen of intermittent regular lines across the screen. Oddly, I tried to take a screen capture of this, but when I pasted it into Paint, it was an image of the title screen proper.
Endless Space loaded in a window, the other two were fullscreen. I was able to switch E.S. to fullscreen without an issue. It also loads fine now with fullscreen as default.
Edited by byrath, 05 September 2015 - 03:38 PM.