UAC Help

Hey, i have windows 7 ultimate with original Administrator account enabled and have a password i have another administrator account that i have created and does not have a password i have made all the necessary changes in policies to enable UAC and in the user account also.
The problem is that whenever UAC ask for permissions i get prompted by UAC to take the permission of the original Administrator user and the one im logged in which it does not contain any password and i dont want to put a password on it how can i make UAC to ask only for the permission of 1 account(the original administrator password)

PS: i cant create a standard user because i have MSSQL running and it does not work when a user is standard :( and i dont want the pc user to have access to anything except stuff i allow him

i appreciate your help thank you in advance.:)

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