If you are trying to uninstall IE 9 from you windows 7 because of some problems of the internet explorer 9,just follow steps below.
1.Click Start button,type Programs and Features in the search box,then click Programs and Features
2.In the left pane ,click View installed updates
3.In the right pane,scroll down to Microsoft Windows ,find and right-click Windows Internet Explorer 9 ,then click Uninstall
4.Kill the alert
5.Choose Restart now to finish the process of uninstall internet Explorer 9 and restore now ,or Restart later to finish it after next reboot
Note:Above steps just uninstall IE 9 but will keeper the old internet explorer version in your windows 7