Windows 7 Rights to format

I had for some time an application written to write configuration on a SD Card for an external device . For doing that I give to the user the possibility to format the SD volume:
With Xp I had no problem, with Seven I have messages telling me I don't have the right to do this operation.
Is there an obligation to sign the exe and how?
Could it be changed by the way we install the software on the customer computer?

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