HD Tune 2.55, the version I have, correctly reports the drive model but has nothing under health and the info tab has none of the boxes checked. I'm wondering if there is some sort of firmware failure.
In addition to that I can't get Windows Update, Civilization 5 (where I first noticed a problem), CPU-Z to run. CPU-z stops at 5%. Civilization appears to load and shows in Processes in Task Manager and Windows Update just sits there with a spinning circle next to the mouse cursor. This all started this morning. The system is an I7-4790, 16gig, 1tb Samsung EVO850, EVGA NVIDIA 980. Other things run ok. I have done a full virus scan, Bullguard, and installed and ran Maleware Bytes (it identified 10 threats which I quarntened and then rebooted). I have also run Windows 7 System File Checker (sfc/scannow), which showed no problems.