thank you for being patient. I got through the first scan, and my computer was in the process of rebooting when the crash happened again. does that affect the instructions you gave me? I can't get...

command prompt open; says "must be admin to run sfc/scannow". I guess it doesn't believe I'm the admin(?). Maybe I should just quit and let it die.(?)

Yeah, I don't know what I'm doing wrong; the upload always looks like it's working, but when I go to check it to make sure, the folder is empty. Possible side-symptom of my computer screwing up?

5 year old Toshiba netbook, purchased with Win7 Starter installed
was eligible for and did free Win10 install in July
has worked fine, up til last Thursday (October 8, 2015)
10/8/15 began...