Server error trying to access network database after install

I installed the feature for multisite by editing the wp config two different times with the right code, then adding in a .htaccess file with the updated info. When I go to network dashbboard I get a server error.. What's wrong?

HTTP Error 500.21 - Internal Server Error
Handler "ExtensionlessUrlHandler-Integrated-4.0" has a bad module "ManagedPipelineHandler" in its module list