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I think it would be best to start at the basics.
Check the IP address of a "working" computer and a "problem" computer.
For W2K/XPyou will need to open a command prompt and type ipconfig. Th Subnet mask entry should be exactly the same on both or this could be the problem. The IP address should be similar but not exactly the same. Depending on the subnet mask, this value could actually be very different.
After having the IP address you should test with ping.
First disable any software firewalls or IP filters on the test computers (one working & one non-working computer). Then, on the working computer, type ping 1892.168.1.11 (substitute 192.168.1.11 with the actual IP address of the other computer). Do you get a "successful" ping or did it fail?
Please post IP addresses, masks, and ping results.
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