How to uninstall IE8 on WIndows XP
This time you need not to worry if you want to switch back to older version of IE6 or IE7. You will find IE8 in add/remove programs list. To Uninstall IE8 from command line you need to execute below from command prompt: %windir%\ie8\spuninst\spuninst.exe
To remove Internet Explorer 8 automatically, You can use a free tool from Microsoft, click the Fix this problem link. Then click Run in the File Download dialog box, and follow the steps in this wizard.
After uninstall you must restart the system to avoid any unexpected errors.