Well are you seeing D now to defrag after that ran? If you are still not simply go right back to it in WE and right click on the drive itself to bring up the properties screen again. On the Tools tab look below for the "Defragment now" button and the defrag tool right there.
Here I run four drives internally but not able to grab a screen for you on how to get to D since you are having problems. Another program Auslogics Disk Defrag
takes care of alll of them automatically on a regular schedule.
One thing I found with that not even scheduled to run lately is the schedule for the Windows defrag has to be unchecked first before you can click to analyse or defrag any drive. Note the screen here even showing the System Reserved boot partitions. The second drive has a letter assigned to that to be able to view just what is on it as far as the BCD store and boot files.
Besides some expected fragmentation on the two storage drives C and the second drive for testing restored system images using either the Windows option or Acronis show both drives at 0% while Auslogics hadn't been run at all since August 2010.