Performance and security enhancements of Internet Explorer 9 make the browser upgrade worth one's consideration. If you need to rollback to the installation of IE 9 for whatever reason, you shouldn't have any issues. I tested the IE 9 uninstall process to revert a Windows 7 system to when it had Internet Explorer 8 installed.
You can uninstall Internet Explorer 9 by using the Uninstall a program applet in Control Panel. Then, select View installed updates.
Then, select Windows Internet Explorer 9 from the list and click Uninstall. After the removal process, Windows will probably prompt you to reboot.
After the reboot, you should have Internet Explorer 8 back in its full glory.
-- Lenny Zeltser
Lenny Zeltser leads a security consulting team and teaches how toanalyzeandcombatmalware. He is activeon Twitterand writes a dailysecurity blog.
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