How to overwrite administrator on Windows 7?!?

At my school everyone is given a tablet computer. The tech guys set up our accounts and we don't have full administrator privileges. I would like any possible way to overwrite this and make me the full administrator. I have tried everything! All I get is you are not authorized or elevation is needed. The... show more At my school everyone is given a tablet computer. The tech guys set up our accounts and we don't have full administrator privileges. I would like any possible way to overwrite this and make me the full administrator. I have tried everything! All I get is you are not authorized or elevation is needed. The computer is a Lenovo X201 Tablet and it has Windows 7.Thanks so much!
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