If both your home computers worked fine for a long time and you didn't make any changes to memory or other hardware but you suddenly start getting BSODs, etc., then would suspect the most likely cause is a virus. A virus can do some very nasty stuff including making them run erratically and/or crash.
I recommend you download and install the freeware version of Malwarebytes. Also download several versions of RKILL (a program to kill rootkits). Once you have Malwarebytes installed and RKILL saved, reboot your machine into safe mode. Then in safe mode run 2 or 3 versions of RKILL. After RKILL runs a few times (and without rebooting, so you are still in safe mode) run a full scan with Malwarebytes and have it delete any viruses found. Links to RKILL and Malwarebytes can be found in our
Freeware DB (NOTE: RKILL is near the bottom of the list)
Post back the results. And if a virus is found then be sure to do the same thing on all your other computers.
Note: when you start Malwarebytes it will offer to start a trial version of their full product, be sure to say NO if you already have an anti-virus product running on your machine. The free version of Malwarebytes is passive, it does not stay resident in memory, it only runs when you manually tell it, so it will not conflict with another A/V, the trial version is an active scanner and could potentially conflict.