What should I do if the window screen can't be taken off?

Casement window: 1 Invisible screen window is the kind of scroll. There are screws on the four corners of the screen window frame, which may be inside or outside. Just use a plum blossom screwdriver to remove it. Ordinary screen window, that is, a single window, where the window frame contacts the screen window, there are elastic pieces nailed to the screen window and distributed on the four sides of the screen window. You can open it by hand until it can't reach the screen window, then grab the screen window and lift it up, first from the bottom, then from the top, and then take it off. Diamond screen window, like invisible screen window, just remove the screws with a screwdriver.