Just run the wizard from each pc and reboot. I also recomend to update the service pack first. If it still not solve, please run ping. Make sure it reachable. If you not sure how to do it, here are some basic step.

open command prompt.
type ipconfig
you will get your pc ip address.
type ping other_pc_ipaddress example to ping pc2 ping 192.168.1.2

If you get unreachable result, it may cause by your connection