Q: I get messages that I have a virus so do I need a antivirus

Click here and follow the instructions, or if there’s a type of adware not covered by them on the computer, these ones.

To prevent future incidents, avoid downloading software from sources other than the Mac App Store or the developer websites.

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You don't have a virus. These are all scams. Don't click on any links nor call any telephone numbers.

Fixes for Adware and Pop-ups:

1. Malwarebytes
2. DetectX 2.11
3. Remove adware that displays pop-up ads and graphics on your Mac
4. Stop pop-up ads and adware in Safari - Apple Support