I loaded APP SDK 2.6 on there, and tried to start cgminer but it was taking a long time to start, and at this point I was so tired of trying different things that I sort of gave up on this for a day. Now cgminer comes up fine and it's working fine. Going to app 2.6 might have solved the problem.

I've run into another problem though: My hash rate is about 20Mh/s below what it used to be. Could this be due to using a newer driver? If so, which driver version *should* I be using?

Something compatible with the 3.7 kernel obviously, though I don't know what. Card is a 5750.