Windows: how to downgrade Internet Explorer 8 to an older version?
Solution 1:
seems nobody know about Comptability View feature in IE8, its was specialy designed to correct such issues you may have with old entreprise web-applications or such. you don't have to downgrade.
Internet Explorer 8 is a new release and some websites may not yet be ready for the new browser. Click the Compatibility View toolbar button to display the website as viewed in Internet Explorer 7, which will correct display problems like misaligned text, images, or text boxes. This option is on a per site basis and all other sites will continue to display with Internet Explorer 8 functionality. When you click on the Compatibility View button for a site, you don’t need to do it again as the next time you visit that site the browser will show it in compatibility mode. If for some reason you’d like to go back to browsing with Internet Explorer 8 functionality on that site, simply click the Compatibility View button again.
more info at msdn.com
Solution 2:
From Microsoft Support, "How do I uninstall or remove Internet Explorer 8" should help you.
Solution 3:
Try this: How do I uninstall or remove Internet Explorer 8?. It's a microsoft support article. If you installed ie 8 prior to XP sp3 you're out of luck and can't remove it. If you cannot get it to uninstall you can try installing another copy of windows into a virtual machine and use IE 7 from there.
Solution 4:
Open CMD and run this command
%windir%\ie8\spuninst\spuninst.exe
Now go head with uninstallation .. The important thing is You need to install any of the previous version of IE after that uninstallation