1. Open Programs and features window. To open it, type appwiz.cpl in Start menu search area and then hit enter.
Uninstall Internet Explorer 9 Platform Preview
2. In the left pane, click View installed updates option to see list of installed updates. Here locate the entry named Windows Internet Explorer 9.
3. Right-click on the entry and select uninstall to remove Internet Explorer 9 from your PC and revert to Internet Explorer 8.