I'm not a tech.  My guess is:  one of the SEND TO folders has links for
those unwanted items.  Find them and delete them -- the shortcuts, that is.
Make sure you can see hidden & system files.  Go to your Documents and
Settings folder.  Search for SEND TO.  Open each folder and look at the
links.  Delete the ones you don't want.  Pay particular attention to the
send to folder in ALL USERS and the send to folder in the profile you're
using.  If there aren't any shortcuts to the unwanted drives in there, then
maybe another program has a different way to add to your right-click SEND TO
items.

If another program messed up your SEND TO list, then you might be able to
remove them by checking the preferences or options in those programs.  If
that doesn't work, you could try to edit the entries yourself, either in the
registry (be careful!), or with a tool such as Shell Extension Viewer --  
SHEXVIEW.EXE -- by Nirsoft.  I can't remember the download location, but I
bet Google would know.  Use it carefully; if you disable the wrong menu
entries, your computer can start acting weird.  If you can find the right
entries with SHEXVIEW, you might try disabling just one entry per day.  Of
course, you'll make restore points first, right?

Hopefully someone with more expertise will answer, but since you bumped I
thought I'd add my 4 cents worth (inflation).

Lady D