|You might be better off using a free anti-virus such as Avast or Microsoft Security Essentials. McAfee is not popular around these parts.|
There is probably a McAfee forum so if you are doing something wrong they are the best people to advise. Otherwise, if you can't find anything in the instructions (such as a help file or document) go back to Walmart and complain.
Always pop back and let us know the outcome - thanks