[Ham-Computers] Copy HD?

[KD7JYK DM09]

I am having a couple of glitches in my OS that don't seem to be going away.
In the past, I have dared over-write the OS without problem, but as an added
measure, I'd like to copy C:\*.* to D:\.  Dragging dropping from Windows
Explorere, only creates a shortcut to C:\, attemping to copy everything from
a DOS prompt i.e. copy c:\*.* d:\ only copies twenlve files form the root
directory.  Using the DISKCOPY command from the DOS prompt, tells me the
drive is invalid (go figure).

How can I copy C:\ to D:\ in Windows 98SE?

Kurt