If you are experiencing any kind of installation issues with Internet Explorer 9, I suggest you to read the release notes for Internet Explorer 9 Beta released by Microsoft which provides all information about the resources and pre-requisites required for the installation of IE9. The release notes explains the Hardware and Software requirements as well as the known installation issues.
Known Installation Issues:
Windows 7 SP1 Beta does not contain all the latest bug fixes for the Direct 2D (D2D) technology used by Internet Explorer 9. Microsoft recommends that you uninstall Windows 7 SP1 beta before installing Internet Explorer 9, to get the latest security updates.
On Windows Server 2008 and Windows Server 2008 R2, you will need to enable the Desktop Experience feature to install Internet Explorer 9 prerequisite KB2120976 (Windows 7), KB971512 (Windows Vista) and KB2117917 (Windows Vista).
Internet Explorer 9 installs as an update to Windows Vista, and Windows Server 2008.
Follow these steps to uninstall Internet Explorer 9:
1. Close all programs
2. Click Start, click Control Panel, and then click Programs and Features.
3. Click View Installed Updates, click Windows Internet Explorer 9 Beta, and then click Uninstall.
On Windows 7 and Windows Server 2008 R2, after you install Internet Explorer 9, Internet Explorer 8 will no longer appear under Turn Windows features on or off. To turn off Internet Explorer 8, uninstall Internet Explorer 9 first.
If Internet Explorer 8 was turned off using Turn Windows features on or off, when Internet Explorer 9 is installed, Internet Explorer 8 will be turned on. To turn off Internet Explorer 8, use Turn Windows features on or off to turn off Internet Explorer 8 after Internet Explorer 9 is installed.
The Windows 7 N and KN Editions do not contain media related technologies such as video playback. IE9 is designed to support HTML5 video playback functionality which is only supported in Windows versions that contain media related technologies. Therefore, on Windows 7 N and KN Editions, Internet Explorer 9 Beta will not be able to install prerequisite KB 2120976 unless the Windows Media Feature Pack (KB 968211) is installed, resulting in no HTML5 video playback. In order to enable HTML5 video playback support on a Windows 7 N or KN, you will need to take one of the following steps: 1) install KB 986211 before installing Internet Explorer 9 Beta or 2) If you have already installed IE 9 Beta, first install KB 986211 and then install KB2120976.
For Windows 7 32-bit and 64-bit Editions, Internet Explorer 9 Beta will not be able to install prerequisite KB2120976 unless the Windows Media Pack (KB968211) or the Windows Media Format Feature Pack (KB968212) is installed, resulting in no HTML5 video playback.
Follow these steps to enable HTML5 video playback support: Install KB 968211 or Install KB 986212 before installing Internet Explorer 9 Beta
If you have issues with installation process after meeting all the necessary requirements or have any other kind of IE9 issue or want more information regarding Internet Explorer 9, consider visiting Microsoft Internet Explorer section of our Windows Club Forum.
You may also visit these pages for more information on IE9: