Determining if current user has Administrator rights

I need to install a HW driver and add it in the registry.
To do this the installation should be running under Administrator rights.

In there any way of testing the current user right and making sure that he has Administrator right?
Any script or plug-in?

Look at this Thread: http://forums.winamp.com/showthread....light=userinfo

Thanks a lot for the pointer.
I can't understand why I couldn't find it while i was searching the forum.