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Problems with 'administrative rights only' errors usually mean that something has changed with the privledges on the logged-in user. Even if you do not remember making any changes yourself, that sounds like the case for you.
Can you access the drive in Safe Mode? In case you are not sure how to access Safe Mode-the tutorial can be found here -> BC Safe Mode tutorial
We are all curious like a cat. We wonder, we ask, we learn.
Please post back when a suggestion works, so that others may learn.