Spinrite from Gibson's research will tell you if there's any physical flaws with the drive...and chkdsk /f already took care of the indexing for you....
where the 'hidden' files you saw .CHK files or something else? I'm not so sure whether the issue is the drive causing problems, or the drive having problems because you're systems having issues..........
Check your mains cable is fully engaged. What PSU, make/model? It may be failing, you only need to lose power for a few millisecond for the system to reboot. Have you installed any new electrical equipment, fridge, freezer recently? Try a powerstrip with interference protection. Run CHKDSK /F until it shows no errors, it takes more than one attempt if there are big problems. I suspect these problems were CAUSED by the unexpected reboot, not a drive problem.
I ran memtest last night. It didn't find any errors.
The CPU is plugged into a 750W UPS by AFC.
I haven't changed any appliances or anything recently.
I can't remember the manufacturer and model of the PSU. The box is in the attic and I could dig it out if need be. I am certain that it is a 650W unit with 3 rails. It is set up for full crossfire support with two video cards.
I currently have a single video card, two HDs and two dvd drives in the case. The PSU shouldn't be maxed out. Is there any good psu diagnostic software ?
I looked at the Dr. Watson log , but I don't know what I am looking at or if it would provide any clues. Any other thoughts ?