Two HDD's, Dual boot, Wrong Drive is SYSTEM

No, not now. C, D and E are all on the 1TB hd. Only F has a functional Windows. Win 7 Pro x64. And, the repair tool when it ran an automated command prompt window DID name its drive C:, which Windows calls F: which is what that drive was called when it was installed and Win 7 Pro x64 was installed on it.
I do not want to keep anything in the C: partition. I am now copying all the stuff I need off D: and E: to two other drives. The nice thing is, if/when it does die the death, it won't keep me from booting.

Nothing can change Win7 from remaining C once it's installed correctly from boot - or change the letter to C if it's not. To even try will ruin the OS.

I'd run the HD diagnostics given to see if your HD can be salvaged.

Well I recall running the brand new Win 7 DVD from the XP Pro x64 desktop (Explorer). So I did. That meant C: was occupied, so W7 installer put it on F: and set up the dual boot.

I will find the WD diagnostic program and see what it has to say. SMART says it's just fine.

Win 7 has been on F: from day one. I note you mentioning that changing the drive letter would not be a good idea.
I'll post the disk scan results as I get them.

So far the WD Data Lifeguard Diagnostics are clear, the drive passes. It also says SMART gives it a pass. I think if any diagnostic shows any problem at all it will be in the electrical/mechanical mechanisms of the drive. As in the motor, motor bearings and motor drive circuits. Simple enough system, I think that's where the problem is if it doesn't spin up properly. The DATA characteristics seem good.
I don't accept that the SMART data passes the drive.
Still running the diagnostics.

You may have boot sector corruption on the HD. Since you don't need the OS on C any longer, I'd move the data off and wipe it with Diskpart Clean Command.

Then repartition in Disk Management and check performance as a data drive: Partition or Volume - Create New

Right, I deleted the two logical drives, then the C: partition, then had windows allocate the full drive space as a single simple partition and format it NTFS. Will see if it wants to keep starting now that I won't lose any data. :)

Did you even read the reason I said you need to wipe the HD with Diskpart Clean command? Boot code remains on the boot sector along with possible corruption until it is wiped with Diskpart.

The steps are in the blue links.

I did read it and your instructions for partition - create volume. Why am I doing all that after it passed all tests?