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Halm is correct. For whatever reason, these computer are not getting addresses from the router. A broadband DSL/Cable router acts as a DHCP server. This server provides the TCP/IP addresses that you computers need to communicate. If this service fails, Microsoft computers will assign themselves addresses that look like 169.254.x.x
If you assign these computers addresses manually, and everything works fine, then it is very likely that DHCP component of you router is the issue. Wheather it configuration/hardware issue....I dunno. We can look at that.
Go to the other computers that and run an IPCONFIG from a command prompt. The addresses range on most consumer routers is 192.168.0.x. The address of the router itself is typically 192.168.0.1. If the results of the IPCONFIG tell you that the default gateway addresses is 192.168.0.1, then this is the case. I am going to take a shot in the dark, and tell you to use 192.168.0.225 as an addresses. With the number of machines were talking about, it is unlikely this being used. Also, like Halm said, it will be important to also configure the DNS addreses is well. This is all done from the same property dialog box in XP.
So, assuming it in 192.168.0.x:
IP address 192.169.0.225
Subnet mask 255.255.255.0
Default Gateway 192.168.0.1
Set the DNS Primary and Secondary addresses to match what is on the other computers. IPCONFIG /all on a working computer will tell you this.
Hope this helps. If its not 192.168.0.x, you can just change the '0' field to match your network. 192.168.50.x for example.
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