Different registration for different roles with different fields

I need to let user register with different roles.

Roles are Companies, Freelances, Regular users.

I found Profile role <http://drupal.org/project/profile_role> module but I
guess is not what I need..

I'd need something that let me chose which kind of role I want apply for
and thend, filling the right fields (I have different fields for every
kind of Companies/Freelance/Regular users)

do you have any idea?

thanks

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