Can't ping modem on previously working machine

Linksys wireless router BEFW 11s4.  Have had a wireless network with 2 computers  both with XP home set up and workng for a couple of years.  Both computers could access the net.  Had a crash on the laptop that is the host on the network.  Have everything on computer working with no conflicts.  I cannot get the laptop to connect to net or other computer.  I have automatic set on IP address, but it can't find the IP.  I get a message there might be a comflict.  None showing in device manager.  I can't ping the modem.  I have turned off the WEP.  I need suggestions.  Everything seems to be set the same on the computers, but the desktop can connect and the laptop can't.
as

Hi , from the control panel go to network connections....right click on the local area connection or the wireless network connection and hit properties.
select internet protocol tcp/ip and hit properties once again.
Ensure that you have not specified any IP address on either connection.
Choose the automatic options for the IP address and the DNS.
Once done....restart the laptop and check if you still get conflict errors.

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