It's interesting, I am the one who started this thread and asked the initial question, and with all the answers, I am still pretty lost. But I at least have some things to consider.
We did defrag, but my program still freezes and quits. Just did it a few secs ago. Grrrr. I save over and over again, but sometimes in the middle of trying something, I don't, cuz I am simply not done. It's very frustrating. I am thinking I will uninstall then reinstall, as when I first started using this program, I didn't have this problem. Hmmmm, will the things I've added on - brushes, etc, need to be added on again?
I think I have something here that's too big for my computer-unsavvy brain!