You could first try re-running the anti-virus in Safe Mode (reached by tapping F8 repeatedly while booting up) but make sure it's up to date first, also make sure your operating system is totally up to date, especially Internet Explorer, even if you never use it (other applications do use it from time to time)..
In Safe Mode you wont be able to open the user interface, instead just go to "Computer" and right-click the hard drive and select "Scan" next to the McAfee icon.
See how the scan goes in that mode, it may be able to tackle all it discovers.
If not, don't worry, check the last link in my signature below and I suggest you run Malwarebytes Free from the link in there under 3rd party tools.
(Note the instructions on how to use it free of charge)
Tell me how you get along with that and when you post back more details such as the operating system, service pack (if applicable) etc.
Toronto ▪ Canada
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