1. Ensure Internet explorer is updated and on your PC it does not have to be default browser
2. Set IE to defaults
3. Try right clicking the shield in the taskbar and verify subscription
Is the product installed ie did you download the setup file and it install?
You can use the below links to activate the corresponding McAfee product using the Key provided. Alter your country using the drop-down menu accordingly.
http://www.mcafee.com/mav/retailcard (McAfee Antivirus Plus)
Once you activated the product you can use the below instruction to login to McAfee account and install the products.
or for the RetailCD version:
http://www.mcafee.com/mav/retailcd for mcafee virus scan plus
Redeemed the product key. Log in if you have an existing account with mcafee if not click register now.
Do the onscreen prompt to download/ install.
If still an issue call customer service at the link below
Volunteer Moderator - Consumer Products