I found this little gem posted on stackoverflow.com by Heinzi.

How to re-enable a hard disabled add-in.

1. In the Manage box, change COM Add-ins to Disabled Add-ins, and then click Go.
2. Select the add-in and click Enable. Click Close.

Now the add-in can be loaded again:

1. In the Manage box, change Disabled Add-ins to COM Add-ins, and then click Go.
2. select the check box next to the disabled add-in. Click OK.

Reference: http://msdn.microsoft.com/en-us/library/ms268871.aspx

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