I want to uninstall Norton Anti-Virus.

When my computer was invaded by a virus called "Privacy Protector," I tried to stop it with Norton Anti-Virus, but the program kept encountering errors. I'm  trying to uninstall Norton  Anti-Virusso I can start McAfee, but on my last two attempts I kept getting a box saying, "File is corrupt" Can  you please tell me how to uninstall Norton Anti-Virus? HELP!