Did you try uninstalling McAfee from the VM Control Panel > Programs and Features, running the MCPR cleanup tool, reboot and then reinstall in the VM from the online account?
Also make sure the VM has an always-on Internet connection (always on while the OS X is running that is).
If that fails to cure the situation then I would contact Technical Support. It's free by phone or online chat.
I must admit that I did not know there was a MCPR clean up tool prior to joining this forum so I didn't use that. I also uninstalled VirusScan Plus via the normal Add/Remove Programs on Windows and not via the VM Control Panel.
Anyway, thanks, @Ex_Brit. I'll give this a try tonight and update this thread with the results
In Win 8.1, Add/Remove is called Programs and Features and is in Control Panel like it's predecessor - but that depends on whether you are looking at Control Panel in Category View or Icon View....same location. I was just pointing the location out.
Good luck ;-)