Error when running the Activation Utility

Error when running the Activation Utility.

When running the Activation Utility, the error below appears:

This error means that Framework .Net 3.5, service pack 1 is not  installed on the server.
This is an update of Windows. When this update is installed, the error won’t appear anymore.

This update can be downloaded from the link below:

http://www.microsoft.com/downloads/details.aspx?FamilyID=AB99342F-5D1A-4...