I'm an administrator but have no rights?

Hi TUN3R welcome to Sevenforums.

Although I am going to answer your question as asked, first let me... educate you a little.

The reason that Windows is asking you if you are sure that you want to run a program as Administrator is because of a process called User Account Control, or UAC. What this basically does, is lock down your account, not against you, but against programs who's intent may or may not be benign. One of the big problems with XP was that a program would have full access to your machine, and could do nasty things to it, and there would be no way to stop it, because you were running as Administrator. As everybody ignored Microsoft's advice NOT to run as administrator, they decided to lock down the Admin account instead, much like Linux or OSX does not give users direct access to "root" functions without a password.

Think of it this way, you download a program, or it downloads itself with a "drive by" which turns out to be malware. Now because this program only has limited access to your account, to do any real damage, it has to generate a UAC prompt. At which point Windows will switch to what is called the "Secure Desktop" asking whether the program is supposed to have access to restricted areas. The beauty of the secure desktop is that the program itself cannot click yes. Only you can. So if this program isn't supposed to have access you can click no, and then remove it, quickly. With XP, you would already be buggered. UAC is basically Microsoft's answer to Linux's "sudo" function.

The security benefits, in my opinion far outweigh having to confirm actions every so often, however...if after considering the benefits you would still like to drive without a seatbelt, as it were, then follow this tutorial. User Account Control - UAC - Change Notification Settings

Well... why not just install a different AV? Again, running without antivirus isn't exactly security conscious either. That's actually a good thing that UAC is asking whether it's supposed to be shut down, as that's what most malware will try to do first anyway.