Did you see the tutorial on upgrading?
http://www.zen-cart.com/content.php?...pgrade-my-site
There are other articles which explain more details.
http://www.zen-cart.com/entry.php?3-...d-of-upgrading
What you would best do for such a steep upgrade is just install v1.5.1 in a subfolder with its own database, then "drop" the tables in that database and "import" the backup copy you made of the old db. Then zc_install should give you the "upgrade" option as it will detect the old db version. This keeps all of your old information and properly brings it in line with the new structure. Then you can work on redoing the template to look as you want.
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