The screen patches can be caused either due to faulty graphics card or screen damage. But there is no surefire way of finding specific cause without proper analysis of system. Here are some ways to fix screen patches.
Update Windows
Update graphics driver for both display and dedicated cards if applicable
Fix color settings
UPDATE WINDOWS
Windows [...]
HOW TO : BLOCK INTERNET CONNECTION OF PROGRAM IN WINDOWS
You would want to block incoming or outgoing connection from program either to bypass frequent online update checks or any reason what so ever.
STEPS
1. Go to Control Panel and search for Window Defender Firewall
2 Click on Advanced [...]