Two OS - and One Red Bar

I had to recover Win 7 in order to install W10.
It should be in a separate drive and named Windows.old, but it looks like an active - but deadly - situation.

When I log in, I have to choose an OS.
I want nothing to do with Win7, even though I wish I could.

How do I eliminate the choice and the scary red bar?

Thank you.

First thing we need to see is a screenshot of disk management:
Disk Management - How to Post a Screenshot of - Windows 10 Forums

Please be sure to widen all the columns so that all the information can be read in them.

I had two OS in the same small space, so I reinstalled Win10 several more times.
Fixed that.
(Everything is new and wondrous and extremely challenging. But these things basically heal themselves. How smart is that?)

Thank you.

CountMike.

Wasn't sure if I really had to reinstall, but I did, with joy. See above.

Thank you.