File Sharing

I have a Wintel ME pc connected via serial cable to a
WINTEL XP/Pro. I want to transfer files from the ME to
the XP. I've enabled file sharing and created a file
share on the ME for the folder I want the XP to have
access to on the ME. I've used the setup wizard on the XP
to set the XP as a guest of the ME pc using serial cable.

When I go to use the connection from the XP it indicates
it is dialing and then error 777, connection attempt
failed because modem or other connecting device on the
remote computer is out of order.

Can anyone tell me what I need to do to get this working?

Thanks