I have the student edition of Inventor 2010.  I imported the ISO library when I installed the software.  I need the ANSI library for the project I am working on.  I followed the instructions on the AutoCAD Inventor website and reopened the software installer.  I end up at a list of the different libraries with radio buttons next to them.  However, I can only click on and modify the ISO radio button.  I am not allowed to click on and install the ANSI library because its radio button is inactive.  Any advice would be appreciated.  Thanks.

The only thing I can think of to help you is in my Version 9 that i have for inventor in order to load an opposite standard I had to uninstall and reinstall.  That was the only way I could get it to work.  I hope someone else knows another way. i think it is kinda stupid you cannot load both.  You never know when or which one you will need.

Maybe it is all you get with the student version??

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If your talking about Document settings, standards tab, annotations, you appear to in fact be limited with the 'student' version.
 
This window on my computer currently displays ANSI, JIS, DIN, ISO, BSI and more.