Hi! The McAfee ads are probably being caused by another reason. It's possibly a scam or an advertisement from McAfee itself.
Uninstall McAfee if you don't use it, and also check if there are notifications from unrecognized websites in your browsers.
- Open Windows Settings (Press WINDOWS + I keys) > Select "Apps" > "Installed Apps".
- Look for McAfee > Click 3 Dots > Uninstall > Wait for the program to be uninstalled > Restart your computer.
- Open a browser you use frequently, such as Microsoft Edge or Google Chrome.
Microsoft Edge
Click the 3 Dots (●●●) > Settings > Privacy, search and services > Site permissions > All permissions > Notifications > Delete all websites you don't recognize.
Google Chrome
Click the 3 dots (●●●) > Settings > Privacy and Security > Site settings > Notifications > Delete all sites you don't recognize.