So, I think we can all make guesses about what the problem is... Ultimately I think all are asking for more information about each detail of what you have done... If you changed the folder name (there is only one admin folder so I don't know what is meant by changing *all* admin to admin) to admin and then did an install, more than likely if the configure.php files pointed to a database that had data in it and you used the same DB_PREFIX as was used in that database, then all of the store data was erased... Now if you choose to do a database upgrade only, then that is another story... There are too many ways that things could have been done. Not enough information has been provided to understand the full current status.
Plain and simple, following this instruction (get some fluids and food before reading, because it will make you scratch your head a little, but it is a solid process to follow) you will be able to have your site up in little time if you work through it step by step and don't take shortcuts... Don't go investigate if this or that works if the procedure doesn't recommend checking at that point... I know it has been provided at least once already if not more:
http://www.zen-cart.com/entry.php?3-...d-of-upgrading
If a step doesn't make sense, stop and ask about it. Explain what you understand, what you think it means, and what you don't understand..
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