|Depends on what is stored on all the drives.|
Normally windows is installed to drive C.
Your your personal data, e.g. Documents, Pictures a.s.o. should be saved on another drive, so that if you have to reinstall windows, you don't loose your personal files.
I suggest to create a folder named data on drive D and under that folder create other folders for Documents, Pictures a.s.o.
Please send a reply, if you solved the problem !!!