You will need to go and modify the TCP/IP settings and make sure they are set to Obtain an IP address automatically.

Here are some instructions to do this.

1. Open Network Connections by clicking the Start button Picture of the Start button, clicking Control Panel, clicking Network and Internet, clicking Network and Sharing Center, and then clicking Manage network connections.

2. Right-click the connection that you want to change, and then click Properties. Administrator permission required If you are prompted for an administrator password or confirmation, type the password or provide confirmation.

3. Click the Networking tab. Under This connection uses the following items, click either Internet Protocol Version 4 (TCP/IPv4) or Internet Protocol Version 6 (TCP/IPv6), and then click Properties.

To specify IPv4 IP address settings, do one of the following:

To obtain IP settings automatically, click Obtain an IP address automatically, and then click OK.

To specify IPv6 IP address settings, do one of the following:

To obtain IP settings automatically, click Obtain an IPv6 address automatically, and then click OK.
Source(s):
Personal experience
http://windows.microsoft.com/en-US/windows-vista/Change-TCP-IP-settings

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