Before you delete anything, post a snip of disk management
for us to see as you don't want to delete the one with the boot files on it; have a look at the tutorial at the link below to see how to post a snip; you can find disk management at, right click computer in the Windows start menu and select manage
, at the left pane select disk management
and post a snip.
C: probably has the boot files.
Uploading/Posting Screen Shots