You've checked the network cabling and determined that there is physical connectivity between the computer and the network.  One machine connects to the network, but yours does not.  Lets look for any differences between these two machines.

Locate a system that is connecting to the network.  We'll want to view it's IP network settings.  Different versions of windows use different methods.

Windows 95/98:  Start - Run - [type] winipcfg

This will open a dialog window that allows you to see what address this computer has.  It may have a static or a dynamic IP address - we don't care for the moment - it is "known working."

Windows NT/2000/XP:  Start - Run - [type] cmd

This will open a DOS window, where you will type "ipconfig" (minus the quotes).  To see more info, type "ipconfig /all" 

Do the same for the machine that isn't working and look for the differences.

• The IP address is the answer to: "What is my complete network address?"

• The Subnet Mask is: "What neighborhood do I belong to?"

• The Default Gateway is: "What address to I look to when I want to leave my neighborhood?"

• The DNS Server is: "Where do I go to resolve a friendly URL to an IP address?"

  See DNS Article.

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