Technical Support may have been able to troubleshoot the issue, and it's a free phone call or online chat session, linked under Useful Links at the top of this page.
However, if you can't uninstall the software using Control Panel > Programs > Uninstall a Program (Add or Remove Programs in XP) then use the MCPR cleanup tool available through that same link at the top of this page.
Reboot when it finishes to complete the removal process.
Edit: I noticed in previous threads I was trying to persuade you to keep your system current and if that is the reason McAfee isn't working properly, then isn't it wiser to bring your system up to date rather than leave it in a rather dangerous and unsafe, unpatched state? If that's not the case then sorry.
As I understand You can't even remove it from control panel, don't know why Mr. Obivan suggested that You should run safe mode and uninstall it from there, and only than You can use MCPR tool.
Tyomni, what are you talking about? I said quite clearly: "......if you can't uninstall the software using Control Panel...."
I put it that way purposely because of people reading this in the future. It's important to use the Control Panel method first if possible simply because that method decrements the online account by 1 machine.
Tyomni, it is not necessary to remove the McAfee from the Control panel in safe mode to run the MCPR Tool. What Peter suggested is the valid one. Thanks,