Hello , sorry about your problems. My name is Marco and I will do my best to help you.
Do you have an unknown program that would run in the background?
To check, right click on the start button and select "Task Manager" and check in the open processes if a program takes all the power of the computer.
If yes, you may have a malicious file in your PC, then do a scan with these two software below (the free version)
AdwCleaner to clean browser: https://www.malwarebytes.com/adwcleaner/
Malwarebytes to clean pc: https://malwarebytes.com/
If not, check if your graphic drivers are up to date. Or simply reinstall them.
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Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.