Well, as far as I know, even scripts I develop use MD5 hashes or other one-way methods of encryption; this means, that they cannot be decrypted by someone, as there is no decryptor function. The password stored in the database would be composed of letters and numbers, and don't really follow any pattern.
So I'm afraid that you'll need to reinstall somehow to reset the password, or if the script you have has an installer, usually you can take a look at the source, run the same function separately, and add that generated hash value just for the password field in the DB. :hehe: it's confusing, but if you need any help, let me know what kind of script you're using.