Could you please let us know if you get this error while reinstalling McAfee or while opening McAfee security center. . . . If possible please provide us with a screen shot of the error for more clarity along with the below details ;
What operating system ?
McAfee installed through a cd or from Online ?
Wait, if they have changed Your hdd means they have changed You os and software, if You had Mcafee before that with license key it would be lost.