Unfortunately, no AV software in the world will protect your machine 100% of the time. Please can you run our Stinger tool and let us know the results please. Make sure you read the 'How-to' first.
If that fails to clean it try one of the 3rd party tools listed lower down this page, Malwarebytes (Free version) is probably best in this case: https://community.mcafee.com/docs/DOC-2168
Make sure it is updated before running and note, it's one of the few pieces of software that can be installed, updated and run all in 'Safe Mode with Networking', if necessary.
If you ask any security software company to remove an infection for you they all levy a charge for that service, however, if it didn't work or made matters worse, you can ask for a refund by calling Customer Service, linked under McAfee Support >> Home and Home Office >> Customer Service, at the top of this page.
Could you PM me your Case Details- I can arrange someone to get back to you on that issue you have.