Multiple PC Wireless Network to Internet problem.

Hi,

I've recently purchased and installed the new Belkin N1 Vision modem router.

3 PCs a laptop and an Xbox 360 all connect to the Wireless Network fine.
However, only the laptop (which runs on Vista) and the PC which runs on XP and the Xbox 360 will connect to the internet.
The 2 PCs that use Vista find the Network but only get a "Local" connection so are completely unable to use the internet.
Both these PCs use N1 wireless USB adaptors.
With the old Belkin modem router we had it allowed all devices to connect to the internet (but routinely went wrong so no devices could connect)

Also weirdly every once in a while one of these two PCs will connect to the internet for a short period of time.

I've tried changing the last number in the IP and even spoke to the Belkin ppl on the phone for 30minutes but to no avail.

They seemed convinced it is a firewall issue, but i turned off my windows firewall and restarted and it still didn't work.

The message i get when clicking the icon between the Belkin N1 and internet gave me some options to fix but they didn't work and gave me the message "Cannot connect with primary DNS server"


I would really appreciate it if anyone could help me solve this.

thanks

Adam.