Click on Start

Click on Control Panel

And that will open the Control Panel Window, either in Classic Mode, or in Catagory View

OR

Open Network Connections (If you don't see it, look for Network and Internet Connections first)

OR

Then

Right-click on Local Area Connection and select Properties from the menu

From the list, double click on "Internet Protocol (TCP/IP)"

Make sure "Obtain an IP address automatically" is selected

Also, make sure that "Obtain DNS address automatically" is selected as well

Click on OK, then OK on the next window and you should be connected to the network