Internet Explorer 8 is built-in to Windows 7, so it cannot be uninstalled - only turned on/off.  Since it cannot be uninstalled, it also cannot be installed, so there is not an installation package that will allow you to "install" IE8 on Windows 7, because it is already there. Paul's post is the correct way to uninstall the IE9 update - uninstalling that update will leave you with IE8. There are some reports of IE9 not being listed in the Updates section of Control Panel/Programs and Features/Uninstall a Program/Installed Updates.  If that is the case, then check out this article: answers.microsoft.com/.../d0243ea9-c050-4a47-80f9-fc176991b835
I have a Dell Optiplex 380 that came preloaded with Windows 7 Pro SP1 (32 bit) and Internet Explorer 9.   Our company is not yet supporting IE9 so I need to rollback to IE8. I went to Control Panel > Programs and Features, Internet Explorer 9 was not listed as a program that can be uninstalled.  So I went to Turn Windows features on or off and unchecked Internet Explorer 9 then rebooted. When I attempted to install a Windows XP copy of IE8 that I have, I got an error stating that this browser is incompatible with the current operating system. After not being able to find a version of IE8 for Windows 7, I downloaded a copy of IE8 for Windows Vista 32 bit. Unfortunately, this too is considered to be incompatible. Also tried setting the compatability for the IE8 install files to Vista SP2 and XP SP3 and run as Administrator, no help. I also checked before and after removing Internet Explorer 9 from the Program and Features to see if Internet Explorer 9 was listed as a Program to uninstall or as a Program Update and Internet Explorer 9 is not listed in either of these sections. Is there a version of IE8 that can be downloaded and installed on a Windows 7 SP1 PC or some type of work around? Any efforts spent to help me resolve this issue is greatly appreciated.
Installing IE8 on Windows 7 SP1