TO DISABLE WINDOWS MESSENGER POP-UP ADS:

1) Click on Start, then on Run.

2) Type services.msc  and then press the Enter key (or click on OK).

3) Scroll down and find messenger. Double-click on messenger.

4) Click on the Down Arrow next to  Startup type:  and change it from Automatic to Disabled.

5) Click on Apply.

6) Click on OK.

7) Close the window.

8) After you restart the computer, you shouldn't receive any more Messenger pop-up windows telling you that you need to buy something.