I would like to know what browsers you use on your PC. The main reason for computer notifications is the browser. When the notification option is turned on in the browser , the notification comes. So I will show you how to turn off notifications in Chrome browser. Go to Chrome Settings from the Chrome browser . After going, scroll down. Click on Advanced text there . After clicking on Advanced , there will be several options. Now click on Content Settings . After clicking, the option like the picture below will come out. From there, you can stop notifications by clicking on the Notification option. As a result, no notification will come to your PC.