I've been referred here by a diligent BleepingComputer helper who ultimately just assisted me in determining conclusively that I need to replace my internal hard drive.
I am in favor of this particular drive:
https://www.amazon.com/gp/aw/d/B013QFRS2S/ref=mp_s_a_1_3?ie=UTF8&qid=1527692407&sr=8-3&pi=AC_SX236_SY340_QL65&keywords=western+digital+2tb+internal+hard+drive&dpPl=1&dpID=519l6PabkxL&ref=plSrchwas not able to provide me with a succinct U
...and am just seeking confirmation that it will be compatible with my system.
My helper had me use Speccy to take a snapshot of my system. in order to help you to make that judgement.
Unfortunately (perhaps due to my current computer woes), Speccy was unable to provide me with a succinct URL to publish here. Thus I am including my snapshot in a text file as an attachment to this post.
Hoping to hear back from someone soon and be on my way to getting my system humming again.