Quote Originally Posted by dandono
they are all peer-to-peer.
You are contradicting yourself. If the computers are part of a Windows domain, this implies that they are not peer to peer and also, that your domain controller acts as a DHCP server.

How is your network setup?
Do you have a DHCP server or do you enter all the IP addresses manually?

What is the problem exactly?

It is OK to have PC's conntect to a domain controller via an 11mbps connection, but it is worth noting that even without WEP enabled you are going to get transfer speeds at best, at 60% of this speed, which equates to less than 1Mb/per second.