source: www.tweakxp.com 

To assign a Static IP Address to your network connection follow these steps:

1. Open Network Connections

2. Right click the connection you wish to assign a Static Address to and choose Properties.

3. In the Properties box that comes up select “Internet Protocol TCP/IP” and click the Properties button beneath.

4. In Internet Protocol TCP/IP Properties place a dot in “Use the following IP Address“.

5. Enter the IP address you wish to use and OK the change. Click OK on Local Area Connection Properties.

6. Reboot