At present I am using Norton and experience similar. It is an old computer running 8.1 so I expect a few issues. In scanning, they claim there are 34826 issues slowing down your computer; View Solution = £16.88 for the remainder of your current subscription. Then they tell me there are also, 712 Broken Registries and 16939 Broken Links. The issues they find, are those that require an upgrade and more money for them. I had plenty of annoying pop-ups, mainly to upgrade, but found how to turn them off.
As my subscription ends, I was considering McAfee, so it was good the read you have similar issues. You need to have your log-in details, and check they work, to prevent their automatic renewals at inflated prices. I have switched off their automatic renewal.