Assuming this is Windows- something, go to Control Panel > Porgrams or pgrams and Features, depending on version, and uninstall any McAfee products from there.
Reboot if asked to.
Run the MCPR cleanup tool http://us.mcafee.com/apps/supporttools/mcpr/mcpr.asp and reboot.
It should be gone.
This is assuming also it was a consumer/home product that was installed and Anti-Theft or any Enterprise product were not part of the equation, if so please advise accordingly.
Cheers mate, worked a treat
Great, all the best ;-)