Access denied error on driver install; same rights as NA

I will try to install a driver for a printer etc on a workstation where I have Local and domain admin rights and I get access denied error. My boss logs on (he says our rights are identical) and he is able to install driver with no problem.
He is stumped because he says he has given me EXACTLY the same rights he has. He has also given me the pleasure of researching this problem…. any and all help will be appreciated.