In reply to Co1in H:
First of all, never pay for antivirus.
Second, never use Mcafee, because it's been shit since about 1998. Other shit antivirus fyi: Norton, AVG, anything you have to pay for.
Third, uninstall all their stuff and download malwarebytes, run that to solve whatever malware problems you've got (probably has nothing to do with viruses). Run it over and over till it scans clear.
Once it shows clear, if you're using internet explorer, download firefox (preferably) or google chrome. Install ublock origin by going tools > add ons > and search ublock in the top right corner. Once that's done also install ghostery via the same method. You should be fine from there, if you notice any issues re-scan with malwarebytes.
If you MUST install an antivirus, go for Avast! which is free. With a decent browser and the above addons it's highly unlikely you'll need one, malwarebytes should take care of any problems, and that's free as well.
Post edited at 10:25