I cannot answer either query sorry, but honestly you are 100% wasting your money on 3rd party AV. Microsoft are ploughing vast sums of money into their anti-malware solutions, particularly to protect and re-assure large enterprise as they move to Office365, you get all the benefit of this for free when you use Defender.
Also keep in mind Microsoft make your operating system, so if anybody knows how it is intended to work and how best to protect it, it is not McAfee/Symantec or any other 3rd party who have access to a subset of how the OS works.
You’ll also generally notice these 3rd party AV solutions slow your machine down and get in your way.
Finally please keep in-mind Dell have a very tight relationship with Intel/McAfee, it is 100% in their interest to persuade you to buy from their partners, they are not incentivised to give you impartial advice.
Your time would be better spent trying to figure out which behaviours on your computer are causing you to get viruses, which are extremely rare these days. You could consider doing more risky behaviour in an Incognito browser window for example. Or if you want to take it a step further, Windows 10 allows you run an Ubuntu Linux virtual machine right in Windows, you could start one of those up and do the more risky browsing in there, it will have no way of infecting your Windows install then.
My 2 cents as a long-time IT security and infrastructure specialist, mileage may vary
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