A UEFI PC looks like this, with an EFI System Partition (and no active flag)
UEFI accommodates MBR drives but it won't boot from one, just uses it for data, so you must be booting in legacy mode.
In that case, I can't see how you're booting at all, since the first thing that happens after POST is to search the MBR for "active".
Your only active flag is on your old E drive, but if the boot files were used from there, your Disk Management would show E as "active"
and "system", so somehow it's getting to C despite the active flag being missing.
Were you UEFI when you were using W7?
Something is clearly messed up (possibly when you used msconfig to remove stuff), which is why neither bcdedit, nor EasyBCD can find information for you. The mystery is how the boot still works. There's presumably some hardwired default fallback code (try the first partition on Disk 0) in the event of finding itself in that situation. (A distinct possibility, since XP used to do something similar in the event of a dodgy boot.ini file, which often got people with simple systems out of hot water)
Since Disk Management won't let you set the active flag on C, you could try setting it using a bootable Partition Manager disc.
All your BCD management tools should start working then.
