If the device is connected physically, try this:
Turn on, wait for Windows to boot
Hold down the Windows Flag key on your keyboard, tap E (release both now). Windows Explorer should appear.
(just a quick double check, the drive isn't showing up here, under "This PC"?)
Right click the "This PC" entry and select MANAGE
Click on Disk Management (need to be careful in this area, don't want to format your C: drive!
Once loaded, can you see the drive listed there? If it is empty (no partition), right click on the Disk 1/Disk 2 (whichever your hard drives comes under) and you can then create a new partition from there.
Once all completed, reboot for good measure and then check if the D drive now appears.