I have a new HP notebook with Vista. It is telling me I don't have administrative rights. But I do!?

My fiance just bought my a brand new HP notebook last night and I immediately got to work installing everything. I have never worked with Vista and of course it comes standard in all new laptops. When I went to install a driver, it gave me a popup notice that I don't have the admin rights to install hardware or software, but it plainly says on my account that I do have admin rights (I am the only user!) I chatted online with HP and the guy told me that w/ Vista you have to have things set up properly to have admin rights. He gave me instructions to Click start, type cmd, click that, right click on Run as Administrator and then type in some computer language. After that I was supposed to log off and then a new admin account should have been available. This did not work. Does anyone out there know any way to byp this glitch, because I obviously need to be able to install software and hardware and have full admin rights. The comp is great, but Vista is not cooperating! Thanks!