BleepingComputer Review:

The McAfee Consumer Products Removal tool allows you to remove McAfee consumer products in the event that they become damaged or are unable to uninstall properly through the Windows control panel.  You can run the McAfee Consumer Product Removal tool (MCPR.exe) to remove all 2005 - 2011 versions of McAfee consumer products. This tool will not run on Windows 98 or ME.

Please note, that the security characters the tool will ask you to enter are case-sensitive.