I use a Trackball Explorer for primary movement, but I know that's not the problem because it works fine when surfing or normal computer business and even the direction keys don't pick up on maneuvering right away. I've had it for 10 years or so, thought about replacing it, but no one is making them anymore and ebay has them listed for $120 - $135!!!

I did just upgrade my video card, if that could be an issue. I thought improving that would solve problems, not create new ones.
My last choice is to just uninstall and completely reload the whole game again. Maybe a driver was eliminated or modified (I don't know enough about computers to dig around and solve the problem on my own, hence the reason I'm posting this).
Any simple solutions would be helpful.