Yoko318 0 Newbie Poster

I recently had my computer put into the store for an upgrade.
When I got it back I noticed something that I did not expect,
where my C drive once was, there was now a C and D drive
composed of my C drive split into two.

Just wondering if anyone out there knows how I can pair
my C and D drive to turn it back into C.
Your help would be greatly appreciated.