Error message when trying to open pdf or attach as pdf in invoice, purchase etc

When clicking the pdf or the email button a popup appears with the following message:

error

You must be able to save as PDF using your microsoft office 2007.

Please add the save as pdf office addon and try again

http://www.microsoft.com/downloads/details.aspx?FamilyID=f1fc413c-6d89-4f15-991b-63b07ba5f2e5

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