error 500 on modules

After test and use G2 I decided to test and use G3. Installation works fine and finally I wnet to change Control Panel issues. I choose other lenguaje (spanish), I choose Theme, but went I click on MOdules button I receive and error 500 display.

I'm using IIS7 on Windows 7, PHP, mySQL,... all at day.

If I submit some photos to an album G3 works fine, but I can enter on Modules and change, add or delete them.

Thanks
Jose Lombardia