URGENT: I disallowed all symbols using User Access. Now I cannot log in with user1 account!!!

I tried to use User Access to disallow characters when users create new account. Now I cannot log in with any account on my website.

I created different deny rule for each sybmol. For example:

%!%
%@%

etc...

I created deny rules for 31 characters:

` ~ ! @ # $ % ^ & * ( ) + = \ | ] } [ { ' " ; : / ? . > , < (and space)

The only ones which aren't denied are underscore and hyphen.

When i tried to log in, i get this error:

"The name ADMIN is a reserved username."

Creating a new account and requesting new password are also denied.

My site is currently live. Please help!