Can see files on D drive( not hidden files)

Hello,
My hard disk has 2 partitions.--c: & d:.
Hidden files feature has been deactivated.
C: 60 GB n can see the files n programmes insatalled on it.
d: 5 GB n shows in properties 4GB used.
Want to see the files n delete those which are not useful.
But all i can see is 2 folders on d: and when cliecked on both folders, it shows empty.

Can u suggest how to check the files /progs on this drive?
Thanks.
Daanyal.