Kendall,

Use Malwarebytes (https://www.malwarebytes.org/) free download software to scan the computer to see if there is something in there causing these messages. Use a good antivirus program, there are good free programs but it doesn't hurt to pay for one and have full coverage.

Spoof messages and popup windows are various ways hackers will trick computer owners into clicking that button to find out about their supposed software problem is how they take their hostages (and there is hostage software out there that, if you follow that link, it will tie up your machine and fry things if you don't pay them to unlock it). If Windows thinks you're using a bogus program, they'll shut you down, or tell you in no uncertain terms, if you try to update. So do run Windows update and see what happens. Guests who don't post with any name, let alone a consistent name, aren't considered reliable sources around here.