Cant ping wireless network card on windows 2003 after installing domain controller

I have a simple ad-hoc wireless network.
PC1= windows 2003
PC2= Windows XP with ICS enabled

I installed a clean copy of windows 2k3 and after that i couldnot ping the pc2 nor could pc2 ping pc1 nor was pc1 able to surf the internet through pc2. The other settings were ok. The icon was also displaying icon in taskbar that the connection is there with good signal. I then checked the workgroups for both computers.

They were set to different workgroup names, after I changed both to "workgroup1" the communication was back and both computers could ping each other.

I then installed the domain controller and dns on windows 2k3, and after that strange things started to happen.

The pc1 can browse the internet through pc2, but none (pc1 or pc2) could ping each other. I dont understand this they are communicating but cant ping, only surf the internet.

Maybe the reason is that the pc2 is still member of workgroup and pc1 is now a domain and memmber of domain. But I cant even join the domain because their is no communication between these PC's.

I have also created a wireless policy in Domain security, and have also added the computer name in active directory. But the results are nothing.

I have searched the internet and almost spend 2 weeks with this but cant figure out whats wrong. I need help.

Thanks

Make sure that both computers have IP addresses assigned manually on the same subnet (such as 192.168.0.1 and 192.168.0.2). Once you've done that, check that firewalls are disabled and you should then be able to ping between them.

If you have your domain set to domain.com, then configure the second computer to be in the workgroup domain. If you want the XP computer to join the domain, make sure that the DNS server on the LAN properties points to the Windows 2003 server.