Hello,
If you deleted the recovery files on your D drive, your recycle bin might be full so check that. if recycling is empty,
I will provide a link for a program WinDirStat, it is a program that shows you everything on your drives even the stuff you don't normally see. It has a graphical interface that is really self explanatory, you'll see what the problem is and you can delete it from inside the program
http://windirstat.info/ the download link is towards the bottom of the page
Network Administrator
Network Administrator for large company, Microsoft certified system builder