But without a better inspection (more to follow) I will rattle them off so you can think about them.
1. Maintenance. At this old you should be at minimum your fifth good cleaning and fan checks.
2. Failing HDD. I'll follow up with a link that helps us figure it out.
Read how to share a Speccy report at http://www.cnet.com/forums/discussions/how-to-remove-pup-option-603542/#post-f742c795-5881-433b-a29b-6d758efe5cd3
That report will contain machine details, temperatures, possibly fan speeds and more.
Windows 10
Internet Explorer 11
NO Chrome - makes things worse .
This PITA occurs 5 to 20 time per day, plus , I have no UTube, no video, and many other breakdowns . This computer system is becoming old (4 to 5 years old) . Its still 'working' more or less - should I junk it and go laptop ?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic