Microsoft ASP.NET 2.0 AJAX Templates for Visual Studio 2008 - Install error

Hi - When I go to:
http://www.microsoft.com/downloads/details.aspx?familyid=5C7DF430-1C34-40D2-B6EC-81353B5FCF2E&displaylang=en

 and install ASPNETAJAXVS2008.msi

I get the following message:


Can anyone help?

Thanks
Matt
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