Prerequisites for installing Internet Explorer 9

When you install Windows Internet Explorer 9, additional software and components are also installed as part of the process. These are Internet Explorer 9 prerequisites, and their details vary, depending on the operating system that your computer is running. However, if some of these prerequisites can’t be installed automatically, the Internet Explorer 9 installation process will not finish. In that case, you have to manually install the prerequisite software and components that are described later in this article.

Things to consider before you go the manual install route

Make sure that no updates are being installed and that no restart is pending.
Internet Explorer 9 might not automatically install prerequisite software and components if the installation of other updates is in progress, or if the system is awaiting a restart. To check whether these things are causing the problem, do one of the following:
  • In Windows 7, click Start, click Control Panel, and then click Windows Update.
  • In Windows Vista, click Security in Control Panel, and then click Windows Update.
If an update installation is in progress, let the installation finish before you try to install Internet Explorer 9. If updates have been installed but the system has not yet been restarted, restart your computer before you try to install Internet Explorer 9.

Also be aware that if there’s a restart pending, you may receive the following error message:

The updates were not applicable.

Make sure you're not running a prelease version of Windows.
If you’re using a prerelease version of Windows, these updates will not install. And here too, you’ll receive the “updates were not applicable” error message. If you receive this error message, make sure that your computer is running a released, genuine copy of Windows 7 or Windows Vista Service Pack 2 (SP2).

If you're not sure which version of Windows is installed, follow these steps:
  1. Click Start, type msinfo32 in the Start Search or Search programs and files box, and then press Enter.

  2. Locate your operating system next to OS Name and your system architecture type next to System Type.

Manually install the Internet Explorer 9 prerequisites

If you’ve ruled out the automatic installation issues we asked you to consider in the previous section, go ahead and manually install the prerequisite software and components. To do this, use one of the following methods, as appropriate for the operating system you’re running.

For Windows 7 or Windows Server 2008 R2

For Windows Vista or Windows Server 2008

Known issues

You may receive an error message when you try to install Internet Explorer 9. Installation problems can have various causes. For more information about how to resolve these problems, see How to troubleshoot Internet Explorer 9 installation problems.

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Windows Internet Explorer 9

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