Hi Kathleen Riley,
Thanks for reaching out to Microsoft Q&A Forum. I understand that you are seeing a McAfee virus alert pop‑up that cannot be closed even though McAfee is not installed on your PC.
Please make sure you already tried the Q&A Assist steps. In addition, please try the following.
To better narrow down the issue, could you please confirm:
- Does the pop‑up appear inside a web browser or directly on the Windows desktop?
- Which web browser do you usually use when this message appears (for example, Microsoft Edge or another browser)?
In the meantime, you can try these steps:
1, Close all open browsers, then reopen only Microsoft Edge and check if the pop‑up appears again without visiting any websites.
2, In Microsoft Edge, open Settings, go to Cookies and site permissions, then Notifications, and remove any unfamiliar or suspicious websites from the allowed list.
3, Open Edge Extensions and remove any extensions that you do not recognize or did not intentionally install.
4, Open Windows Security, select Virus and threat protection, then run a full scan using Microsoft Defender.
5, Restart the PC and check whether the alert still appears after signing back in.
6, If the pop‑up only appears after visiting a specific website, avoid opening that site and clear the browser’s cached data.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.