The first few times I installed the Admin Role module, I wasn't able to get it working. It's a great little helper module that creates an Admin role that is automatically assigned all the permissions to any new modules that are installed. Note the update.php will still only work for the "real" admin (user #1). Here's how to get it working properly:

1. Install Admin Role module and enable on the Site Building > Modules page under Administration

2. Go to User Management > User Roles and create a Site Admin role