Hello. You might be a victim of adware, so do the following:
Also, have a look at the links provided below.
https://www.mcafee.com/support/s/article/000001899?language=en_US
https://www.bitdefender.com/consumer/support/answer/2574/
https://malwaretips.com/blogs/remove-fake-mcafee-pop-up-virus/
https://malwaretips.com/blogs/the-mcafee-your-pc-is-infected-with-5-viruses-scam/
Regards