[Fruit Pie Jones]

I recall having this issue a long time ago as well, but only with certain key combinations. Depending on which keys you pressed, you could only get a couple at the same time without problems, or you could get more than you'd need. I think it had something to do with the way the keyboard was wired. Try remapping your controls (if possible) on games that are afffected by this, and see if you can find some combination that will work.