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Update Internet Explorer
Internet Explorer is a web browser that ships with Windows, so updates for it are included when you install Windows updates. To enhance the security of your browsing experience and to help fix or prevent problems with Internet Explorer, make sure that you install all available updates for Internet Explorer.

Open Windows Update by clicking the Start button , clicking All Programs, and then clicking Windows Update.

In the left pane, click Check for updates.

If any updates are found, click View available updates.

Make sure the Internet Explorer updates that you want are selected, and then click Install. If you are prompted for an administrator password or confirmation, type the password or provide confirmation. 

http://windows.microsoft.com/en-US/windows-vista/Update-Internet-Explorer