Notes on Recovering From System Crash and How it May Help Someone Else
Hi all.
Here is what I learned:
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System running GSA-SER crashed. Was running on a PC, not VPS. With tons of other software NOT for SEO as well as other SEO software. And NO recent disk image! 
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At some point, Windows crashed. 
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Made a new OS from a basic one I had, all was OK.
BUT...GSA was crashing. Photoshop was crashing. Any time the processor hit high, my system intermittently crashed.
Nothing was helping.
Windows logs showed the on-board graphics card software faulting and then the system going down..but it wasn't EVEN the graphics processor or it's firmware or software.
This was a secondary issue (apparently??) caused by.........OVERHEATING! 
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In the process, I undid the processor fan lock. I left it open. 
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Locking the fan in place, it seems OK now.
Not a Windows fault after all, nor Windows update, nor a program/"app" fault (tho there are lots of them haha, but not from GSA), nor malware, nor a virus, nor a rootkit.
Tho I did learn about sick $#!+ called microcode and EFI persistent malware and just how comprehensive the Windows error-logs are, tho not always an answer to de-bugging ALL system issues.
Remember, if it's not a VPS, check your physical set up FIRST on odd happenings, GSA friends..