Make a Drupal site accessible again

Closed - This job posting has been filled and work has been completed.

Job Description

I have a web site developed in Drupal (a VERY old version of this CMS), and I am unable to edit contents. If I access as an administrator (apparently I can), when I go to 'edit', any page, I receive the message "you are not authorized to access this page".
I would like to be able to reestablish administrator privileges, and I am seeking for help. Anyone able to solve this issue? Thanks,
guido fuortes