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Installation Issue - Failed to install with error SharePoint 3.0 not installed (it is)

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I am working with SharePoint 2010 Foundation. I previously successfully installed and used these custom activies.

Following are the steps I took to get to the above error "SharePoint 3.0 not installed." - keep in mind Useful SP Designer Activites was already installed and working.

I installed a form program that sits on top of SharePoint called Infowise Ultimate Forms, which installed corrected and with no issues.

a few days later I notice that my workflow that were using the Custom Workflow Activies are failing.

I checked the workflows and they say "Error Message: Could not deserialize object. The type 'DP.Sharepoint.Workflow.SendEmailExtended' could not be resolved."

So I look in my actions and the Send Email Extended is missing (along with all the other custom activities).

Then I take a look at Central Admin Manage Site Features and the Useful SP Designer is not there.

I try to reinstall and get error "SharePoint 3.0 not installed."

Am I missing something?

Any help would be greatly appreciated.

Thank you

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