1-First type appwiz.cpl into the Search box in the Start Menu and hit Enter which will open Programs and Features. Alternately you can open the Start Menu->Control Panel ->Programs and Features.
2-Now in Programs and Features click View installed updates located on the left pane.
3-Then find Windows Internet Explorer 9, right-click on it and uninstall (click on yes when it ask you if you are sure to unsinstall the update).
Then a restart is require to complete the uninstall process. Restart the computer.
This will restore you back to IE 8 and you will need to go through the process of setting it up again.