Please maximize the Disk Management window so that we can see all of the drives and listings.
There is no unallocated space showing where you shrunk D - did you undo it?
Have you made your Factory Recovery Disks off that partition before messing with it? It isn't recommended to change its size as it may not run - unless you want to get rid of it and rely on the Recovery disks if needed to recover.
Many tech enthusiasts use a clean-copy Windows 7 DVD installer when needed to re-install windows 7
. If you want to move in that direction, you dont' really need the factory OEM partition either since a clean reinstall wipes out the useless factory utilities which have better versions built into Windows 7.
Another consideration is to move storage to an external or secondary HD and limit C to OS/Programs and User folders - although even User folders can be linked to another HD or partition.
Tell us if there is anything else you'd desire as the tool we use can do anything at all that you want with your partitioning.