My D drive is full. There's not even enough space left to defragment. I have 156KB free. My computer is SLOWER than molasses. I can't figure out what is tying up all the space. I don't have an over abundance of programs loaded. How can I see what's on D drive? How do I know what is safe to delete? Thank you in advance to anyone who can help...Ava

You can still see your D drive even if it is full.

My D drive is full. There's not even enough space left to defragment. I have 156KB free. My computer is SLOWER than molasses. I can't figure out what is tying up all the space. I don't have an over abundance of programs loaded. How can I see what's on D drive? How do I know what is safe to delete? Thank you in advance to anyone who can help...Ava

download and install and run ccleaner it will only remove unneeded temp file and other s-it that are not needed .
http://www.filehippo.com/download_ccleaner/

If you haven't run a disk cleanup recently, run one!

my computer > D: drive, wouldnt that open the folders to view surely?

btw , isn't D drive the disc drive on most PC's ?
Do you run 2 hard drives?
Making the slave (secondary HDD) D drive?