Not sure what router your using but check your router settings for number of computers and addresses, most default to 50 with the addresses of 192.168.1.100 to 192.168.1.149
the 192.168.1.1 will be the gateway of the router.
I see your grex is numbered 5 and your computer 11, that being the case just renumber
Another issue is to make sure the windows firewall is turned off on early versions of xp it blocks the connecton.
go to network connections right click local area connections select properties, select advance tab, select windows firewall settings then turn off