Prevent prompt to install PowerPivot for Excel add-in

Hi,
We are rolling out Office 2010 and it includes a separate PowerPivot for Excel 2010 add-in right after Office finishes installing. The upgrade script I wrote is working fine. After the upgrade has completed, you launch Excel and get prompted to install the PowerPivot add-in.

Is there a setting you can change in the registry that will allow/trust the add-in in advance so it will just install without prompting the end user? I have seen many other Office add-ins do this where after you run their MSI, the next time you run the app it applies to such as Word, you will get a prompt similar to this.

I think there is a way to suppress the prompt but I can't remember how it's done.

Thanks,
Rob

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I'm not familiar with PowerPivot, but I'd probably monitor registry writes during Word/Excel/... startup with Process Monitor, and then pre-set the relevant registry values with a Group Policy Preference.