Your IP networks don't match, just as DG points out.

Now, the question I have is "why are you using those networks?" Were those IP networks and masks left over from something a router assigned to you via DHCP, or is this something your ISP assigned to you, or are these numbers you just picked for your use?

Next question I have is "is there a reason why you're using a class B network/mask for such a small network?" The way you have your subnet masks configured, you could have 32K unique IP node addresses in there. I'm guessing you aren't going to be running that many hosts anytime soon.

If these computers aren't going to be connected to the Internet directly, or if they are going to be connecting through a firewall, Internet Connection Sharing on Windows 2000/XP/Vista, or if you have some other proxy server, then consider assigning all your non-gateway computers a RFC-1918 address, network and mask.