How do we get rid of McAfee for GOOD (it's not in the "Remove Programs" area of the Control Panel)

Our subscription for McAfee ran out and my mom doesn't want to renew it, she wants to get Norton instead, but McAfee is waging war on our computer and won't take NO for an answer! It won't let us do ANYTHING anymore. It's like digital harassment. I can't even open the "Start" menu anymore! It is screwing up our computer sooooooooooo bad!!!!

The whole task bar is frozen, I can't get on the internet without "verifying" the subscription, and I can't even send an error report when it freezes six times after I restart the computer. It's not coming up on the Ctrl+Alt+Delete Task Manager either.

I HATE MCAFEE! How can I make it go away and stay away??