Is security centre red? Can you rerun scan and take a pic of the message please.
Try running MVT the virtual technician it is on the tech support link in useful links tab above
Please check the below before running MVT
Go to Control panel – Add/Remove programs : (it would be Programs & features in Vista/Win 7) – Check for any other security software installed on the PC
Right click on M icon on the system tray and check for Updates
Then run MVT from Useful links or from here : http://mvt.mcafee.com and let us know the status