Well if you didn't change anything, Windows didn't change anything, and your game didn't change anything...
Have you downloaded anything besides the aforementioned driver updates and Windows reinstalls?
Give this a spin:
https://downloads.malwarebytes.com/file/adwcleaner
-Download Display Driver Uninstaller:
https://www.wagnardsoft.com/
-Go to Nvidia's site and download the latest driver package - don't install it yet.
-Disconnect your etherrnet: stops Windows from installing a default driver.
-Run DDU(requires safe mode), select gpu driver, then click clean and restart
-After the restart and you've logged back in, find the driver package and install it - DO NOT INSTALL GEFORCE EXPERIENCE - opt for the clean install.
-Once that's done, you can reconnect your ethernet
Then go into Nvidia Control Panel, click on 'Adjust image settings with preview', click on 'Use the advanced 3D image settings', then click on 'Take me there', and make the following changes:
Power management mode: Adaptive
Texture filtering - Quality: High performance
Vertical sync: Fast
Click Apply, then close NVCP and check your games again.