Failing video cards or a driver issue. If this is the same OS and drivers you used for years then the card is suspect along with heat.
Are you performing the monthly or so canned air cleaning of vents and heatsinks? (depends on make, model!)
If not try a good cleaning and check that all fans are operational.
I have been recently getting this graphical glitch where (as the pictures show) make the pc blue screen or just become unusable. I have done the whole reinstall and update drivers and windows plus I have gone into safe mode and check my windows. From there it seemed nothing was wrong if you need any more information please let me know -photo links https://ibb.co/g7bZXv
https://ibb.co/gOposv
https://ibb.co/f9pzza

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic