My computer hangs when file sharing in process

Dear all:

I am using Mn-700 base station, 1 mn-730 (Win Me), 1 mn-
720 (Win XP), and 1 wired computer (Win XP). All
computers can go to the internet with no problem. I can
share file between 2 XPs. However, when I transfer files
from the WinXP to Win Me, it works for the first 5
secords. After five seconds, my computer will hang. So
any large file cannot be transferred (e.g. 6M). Any
hints??

Anu comment and suggestion will be helpful. Thanks

I am not updated to WinXP SP2 yet.