Also as usual, may help if the questions of the posting tips are answered...
Haven't followed the below links as suggested by dbltoe, but something that has helped me in the past is to use the sql for the version from which upgrading in the following thread:
http://www.zen-cart.com/content.php?44
One issue at the moment though is that likely your password has been "rewritten" because of the attempt to login to the admin... Don't recall the "affect" of the rewrite, but it is not a standard part of the upgrade and can make it difficult to upgrade...
The other thing I have seen is that the admin user_id has been 0 as well as the admin_profile. These should all be non-zero values...
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