I tried this module and it works to an extent to prevent users from editing user 1 account, but then i tried the "block selected users" and whoa! user 1 was blocked! The user 1 account is not yet protected if it can be blocked from the user administration page by a user with administer users permission, this is critical.

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Try this patch which removes the need to give users the powerful 'Administer users' permission: http://drupal.org/node/1717876#comment-6843720
See if that helps with this issue...

Issue summary:View changes
Status:Active» Closed (duplicate)