It's possible that MVT can't find products if they come from a 3rd party supplier such as your ISP or your computer-maker. They re-label them often so it fools the software.
1st make sure that Windows 7 is totally up to date in all aspects, including Internet Explorer, which should be IE10, plus make sure it's add-ons are up to date. McAfee uses IE for functionality so ensure it is at its default settings.
Try uninstalling everything McAfee via Control Panel > Programs > Uninstall a Program.
Then run the MCPR cleanup tool and reboot. If it fails to remove everything run it a second time, reboot.
Go to your online account and install your software again.