1
What are the additional Administrator rights?
You need to give your user account access to the key container located at C:\ProgramData\Microsoft\Crypto\RSA\MachineKeys
In case you reset your key container to a new one, and forget where it is.. you can reset the key container for the strong name utility using sn.exe -c. So, if the account access fix doesn't work, you may be using an alternate key store so a reset may be in order.
I would try sn.exe -c
before if changing the permission on the folder does not work.