Cursor not working in Infinity Engine games.

Lately, when I try to get into my infinity engine games (BG I & II, SoD and IWD), my cursor doesn't show up anywhere on the screen and tabbing doesn't highlight any options. It started on modded versions, but I restored to vanilla and I'm still having the same problem. I only have 4GB RAM, I hope that's not the problem.
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It didn't make a difference. Sorry.
The cursor "works" if that makes sense. I can hear it, I'm able to click through the loading screens, and occasionally, through sheer luck, I'm able to find a button by clicking randomly. I just can't see it.
Also, it works fine on Neverwinter Nights and everywhere else.
How do I do that without being able to see the cursor in the first place?