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Receiving "An Unexpected Error Occurred" when removing the ExactTarget solution

Knowledge Article Number 000212791
I am attempting to remove ExactTarget in Microsoft Dynamics CRM 2011 by:

1. Going to Settings | Solutions.
2. Selecting ExactTarget.
3. Clicking Delete.

However, I am getting the message "An unexpected error has occurred." After downloading the details, the full error is displayed similar to the following:
Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: An unexpected error occurred.Detail: 
<OrganizationServiceFault xmlns:i="" xmlns=""> 
<ErrorDetails xmlns:d2p1="" /> 
<Message>An unexpected error occurred.</Message> 
<InnerFault i:nil="true" /> 
<TraceText i:nil="true" /> 

You're receiving this message because the operations required to uninstall are taking longer than the default timeout settings will allow.

To successfully uninstall the ExactTarget solution, change the registry timeout values, so they're double the default settings. 
After those changes are made, re-attempt deleting the solution. Once the solution is successfully removed, revert the settings in the registry back to their default values.

Default timeouts

Default timeout value
30 (seconds) 
1000000 (milliseconds) 
300000 (milliseconds) 

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