Hi Ed,
sorry to hear about your problems with the Toshiba laptop. I agree with both Neem & Henk that it's looking a lot like a failing hard drive issue. Toshiba uses the worst quality drives on the market in their laptops (Toshibas which are really Fujitsu's and Panasonics). Therefore they are only designed to last 2 years before failure. If your laptop had W8 on it when you bought it, it's now 6 years old and if you are the original owner of that laptop and you've never replaced the hard drive in it before it is HIGHLY likely that your hard drive is failing or has failed completely *and thus the recurring error messages on boot up*.
Also, RAM stick failures can produce these same kind of messages, and you have to test your RAM memory sticks (all of them) to narrow things down. I recommend that you take a look my free
TROUBLESHOOTING GUIDE here for step-by-step testing on your HDD & RAM memory:
Windows 10 - Unclickable Task Bar
A couple of other things you should know, Toshiba, just like Dell, HP, Acer, and all other laptop manufacturer's built-in hardware diagnostics are not reliable and are very rarely used by trained repair Techs.
DO NOT RELY ON THOSE FOR THE HEALTH OF YOUR HARDWARE!! Finally, Toshiba used to be #1 in the World just about 18 years ago, and had close to 75%of the worldwide marketshare. In 1999 or so, Toshiba made the decision to stop assembling their laptops (the Satellite line at first) in the U.S. (In Irvine, CA, a suburb of Orange County CA about 60 miles southwest of Los Angeles). Once that was done, Toshiba moved those factories back to Japan and laid off hundreds of US workers here. There product quality has steadily dropped year after year since then, and has never recovered. The majority of laptops from US makers, Dell, Lenovo, HP have all moved to China for their manufacturing beginning in 2005. The rest are mostly in Japan, and a handful are made in Europe (such as MSI and Clevo). I certainly get a lot of broken Toshibas, they don't last nearly as long as they used to, but even more HPs as they keep a roof over my head.
My recommendation is to look at Dell or Samsung; the rest of the players in the laptop market are certainly not recommended. At least with Dell and Samsung you'll get the best bang for your buck.
Cheers!
<<BIGBEARJEDI>>