Malicious websites can use Chrome desktop notifications to make it appear that your computer is infected.
\uD83D\uDCD8 Instructions
Launch Google Chrome.
Select the 3-dot menu and choose Settings
On the left, select Privacy and Security then Site Settings
Find the website in your Allowed notifications list and remove it.
Highlight important information in a panel like this one. To edit this panel's color or style, select one of the options in the menu.