Choose between 2 OS on startup [Help please]

Qtech

Reputable
Jan 20, 2015
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4,510
Hello! Im in need of you guys expertise.
Whenever I start my PC I have to choose between 2 OS.
Im aware that I can turn this off in Startup and Recovery, but I'm not interested in the second OS. Could you help me removing it?

Im pretty sure everything gets stored on the New Volume D:
Here is a screenshot of the Disk management
K0GUTrA.jpg

Im running Windows 7 Ultimate

Thanks in advance!
Cheers