Trouble fully uninstalling Norton Internet Security

I am trying to fix my Windows Firewall and the script to run it from Microsoft keeps telling me that Norton Internet Security is still installed and that is why it cannot run. I did run the uninstall as well as the Norton Removal Tool (several times) and it still seems to think it is installed. What else can I do to try and uninstall the product? I am really hoping I can avoid having to wipe my entire machine to recover from the malware that infected my machine (the firewall is the last piece to get going again)