In Local Area Connection, TCP/IP properties is it configured to obtain an address automatically (from DHCP)? If it is then you can go to Run, type CMD to get a command prompt and type "IPCONFIG /ALL". If it comes up with anything that starts with 169.xxx.xxx.xxx then it's trying to get an address from DHCP and for several possible reasons is not getting a response from DHCP and is just giving itself what's called an APIPA address. If this is happening one quick solution is to manually configure TCP/IP properties and give the computer an address you know is in the correct range for your router. The range likely begins with 192.168.1.xxx. If you do wind up giving the computer an adress, then also configure the "default gateway" address as the address of the router - likely 192.168.1.1. That's the way many home routers come configured from the factory.