Windows 7: Remove network drive location from explorer navigation window

I commonly use remote desktop to my work computer from home and my 3 drives on my home computer show up in my navigation pane on my work computer. I'm believe I was playing with some registry tweak in the past that made this happen but I've since realized I need to undo it. The problem is that whenever I'm not remotely connected from home to work but rather sitting at my work computer and when opening explorer, there is a lengthy delay in opening explorer until it gives up on locating these missing network drives. You can see them notated below as drives A, C, & D on HOME-PC. Any details how to remove these drives is greatly appreciated. Thanks.