Hey everybody! Just wanted to let you all know, my computer is fixed, and operating normally now.
DL65 suggested that I install all my available windows updates, including XP SP2. So I did all that.
Than, just for the heck of it, I decided to re-boot into safe mode, and see if I can access my control panel while running in safe mode. Bingo! It worked! I went into user accounts, and had to reset the Admin. account.
Than, I booted back into normal mode, and everything is running okay. I can now access my CP, and I can run regedit also.
So, I wanted to thank you all for your time and efforts in helping me. The next time someone comes here with a problem like mine, ask them if they can access their CP while running in safe mode. I'm not sure, but I think that might have been the trick.
Thanks again, I appreciate the help!