Can’t share on my wireless network

I just went wireless, I have the Linksys 802.11g router and 2 Linksys wireless cards also G’s. I am running W2K Pro, Win XP Pro and Home on 3 machines. All of them have internet access but I can not see any of the machines, I was also unable to deploy WEP, none of the machines but the one connected to the router via ethernet could access the internet. ANYONE got any ideas, I am going crazy here.