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Consider the following scenario. You perform an unattended installation of Microsoft Windows 7, and as part of the installation you customize the default search provider. Once the installation is complete, you attempt to launch Microsoft Internet Explorer, and an error similar to the following occurs:
During the unattended installation, the SearchScopes value is changed from its default setting, but the associated DefaultScope value is not changed accordingly.
To avoid this problem, do not change the search scope during the unattended installation. Instead, you can customize the search scope using a startup script or other similar registry modification after the unattended installation has completed.
(http://go.microsoft.com/fwlink/?LinkId=151500)for other considerations.