When the advertisement pop-up window appears, right-click the taskbar at the bottom of the desktop to pop up a dialog box, and select Start Task Manager to see the running application. If you don't install it yourself, or don't know the purpose of the program, you can Baidu it and end the process if it's useless.

If the specific program is not displayed, you can view the process, and the background program that the system is running will be displayed here. You can judge whether it is an illegal process according to the name. If you don't know the specific process, you can also query Baidu. And you can find the location of the process and tell whether it is a system process or an advertisement pop-up.

It is suggested to install 360 security guards and other system management software in order to find useless startup items. Disabling advertising pop-ups can reduce or avoid advertising pop-ups.

The pop-up window itself will also have settings. You can try to open its settings, close or stop running.