check ur TCP/IP settings..make one of them pc a HOST PC..just give the settings one time on ur HOST PC as IP:192.168.0.1.....and
submask as 255.255.255.0...no need to give any setting on other pc left them blank on automatic.
and on all other pc just run the home or office networking setup ..never forget to check box for internet and file sharing box in the setup...then restart all and enjoy.