thanks for the tips. It should solve the problem by

reinstalling ipw3945, however, I followed everything in the installation instructions(takes about 3.5 hours to complete the whole thing), and i still can not get my intel 3945 to work:

# /*****in/ipw3945d
ipw3945d - regulatory daemon
Copyright (C) 2005-2006 Intel Corporation. All rights reserved. version: 1.7.22
2007-10-16 04:10:44:
ERROR: Could not find Intel PRO/Wireless 3945ABG Network Connection

# modprobe ipw3945
FATAL: Module ipw3945 not found.

# iwconfig eth1
eth1 No such device

It is almost as if nothing has been done. This is so odd.