okay, this is what i did:
went to network connections, and then manually entered in our info. i basically just entered the same thing for each computer, except for the IP address i kept on going up 1 from .102. We only have one DNS server i guess.
I don't change any of the other info from computer to computer? Also, should i do anything in my router? Also, will a range expander affect any of this? It shouldn't as long as we don't use the range expanders IP, right?