Here I have simple and fast tutorial for changing your IP on LAN and certain other network types( Except Broadband) .
First know your own IP.
1. Click on "Start" in the bottom left hand corner of screen
2. Click on "Run"
3. Type in "command" and hit ok
4. Type "ipconfig /release" just like that, and hit "enter"
5. Type "exit" and leave the prompt
Now change IP:-
6. Go to control panel-->Network connections
7. Chose your network connection and right click on tab.
8. Click on properties, press Networking tabs. Now double click on TCP/IP.
9. Click on "Use the following IP address".
10. Create an IP address (It doesn't matter what it is. I just type 1 and 2 until i fill the area up).
11. Press "Tab" and it should automatically fill in the "Subnet Mask" section with default numbers.
12. Hit the "Ok" button here
Job is done, your IP has been changed.
You should know how to get back the original one.
13. Right click on your network tab.
14. Go back to the "TCP/IP" settings
15. This time, select "Obtain an IP address automatically"
16. Hit "Ok" again