Windows 7: Disk Management

Switch back to the way it was, all you were missing is the assignment of M: to that particular drive. Now that you have it set on M:, make C: your default system drive or D: if that is where your system is (backup files are not boot files).

That's my question: How do I do it? when I click on C: in Disk Management it shows
C: healthy (Boot, Page File, Crash Dump. Primary Partition)

When I right click on C: in Disk management, the only option I see that I could use is Mark Partition as Active.

M: shows: Healthy (Healthy,System, Active, Primary Partition )

If I mark C: as "Active" what happens to M properties?

Both D: and M: have a Boot folder and a Bootmgr file on them

M: will become non-system, not primary but still active.
Make C: the system drive.

I apologize for being so ignorant on this

So, the option for c:"Mark partition as Active" will then make C the system drive?

And the PC will boot from C:?

What about the boot files on M:....do I just leave then there?

Did you copy boot files from C:, move them to M: or re-installed windows ?

neither. I did not move them or re-install Win7.

Then make C: active only.