I've been playing Wiz 8 for several weeks. So far, everything has worked fine. Now, when I start the game, the mouse is moving at an extremely low framerate. The cursor updates once every 2 - 3 seconds. It's first apparent in the main menu, but persists in-game.

-All other games/programs work fine. It's just Wiz 8 that has the mouse issue.
-I've tried two different mice, plugging into various USB ports. The new drivers install, but it doesn't fix the issue.
-I've deleted and re-installed the game from GOG.
-I've deleted and re-installed the game from the original CDs.

I am completely stumped. I have never had a mouse issue in 3 playthroughs. I am wide open to any suggestions.