Karen's computer got taken over by a scammer who convinced her that he was from AOL when she was having trouble with her account. Leo says that gaining control of her computer remotely likely gave him that control and the only thing she can do is backup her data, format her hard drive, and reinstall windows from a known, good source. If one needs help from AOL, contact them directly here - https://help.aol.com/products/new-aol-desktop
This is why Leo is recommending most people use Chromebooks now. For basic internet use, it's more than adequate while Windows is overkill.