Moved out of Community Help as obviously this isn't a problem about this forum.
More information please? What McAfee software is installed, do you know? What operating system is on the machine?
By expired, how old?
If it it wont remove through normal Control Panel > Programs method and it's the Consumer/Retail version and was issued in the last 10 years or so then use the MCPR cleanup tool HERE.
If it's unsuccessful please tell us more information and we can go from there.
If the worst comes to the worst you can contact Technical Support by phone or online chat, it's free and linked under Useful Links at the top of this page.