If the IP settings are assigned to your computer automatically by using DHCP, contact your network/DNS administrator. The ...

If the IP settings are assigned to your computer automatically by using DHCP,
contact your network/DNS administrator. The administrator should configure the
DHCP server to set up the DHCP clients with the DNS servers used for name 
resolution. To check whether a network connection is automatically configured, 
click Start, Control Panel, Network Connections, ( in category view you need 
to select Network and Internet Connections before you can choose Network 
connections) Right-click the connection to be configured, click Properties, 
select Internet Protocol (TCP/IP), and then click Properties.