How to downgrade IE9 under IE7 under Win7 system

                  Windows 7 or Vista system users upgrade from IE8 to IE9, no need to uninstall the original IE8 system, Microsoft should use a process of packaging and unpacking, if you upgrade, IE8 is packaged and sealed, if you want to change IE9 back to IE8, decompress Sealed package.
Since understanding the principle, then it is very easy to change IE9 back to IE8. Steps to change back to IE8:

IE9 is for Windows 7 /Windows Vista users, so the following steps need to be performed under Windows 7 or Vista:
1, click the "Start" button in the search box Type Programs and Features, and then click View Installed Updates in the left pane.
2, under "Uninstall Updates", scroll down to the "Microsoft Windows" section.
3, right-click "Windows Internet Explorer 9," click "Uninstall", and then click "Yes" when prompted.
4, click one of the following options:
(1) Immediately restart (complete the Internet Explorer 9 uninstall process, restore the previous version of Internet Explorer).
(2) Restart later (waiting for you to shut down or restart your computer).