Changing system name in network

[Gordon Keehn]

Hi, Guys
    Unforeseen (and unfortunate) circumstances led me to the point where 
I had to change the system name of one of the PCs (Win2K), with several 
shared resources, on my home LAN.  While the Win box was down, I changed 
the appropriate entries in /etc/fstab in my FC2 box to reference the new 
host name.  However, after rebooting both systems, the Fedora Core box 
still appears to be mounting the shares under the old system ID.  I have 
two sets of icons on my KDE desktop:  one with the old system name, 
identified as mounted, and the other with the new system name.  I can't 
dismount the old shares (which don't really exist?) and can't mount the 
new ones.
    How do I convince Fedora that the old system name no longer exists, 
and it's OK to let go of the shares under the old name?
    Thanks,
Gordon Keehn