Help! I've reinstalled several times..

I have upgraded from 1.2.1 to the latest 1.3. First I get an Admin error, so I delete the Admin table in the database. Then it all setups fine and the first page looks fine and then when I click Admin toolbox I get:

Several lines of:

Warning: session_start() [function.session-start]: open(/home/users/web/b1635/pow.tillie/photogallery/cgi-bin/tmp/sess_cd49e3bdcc9d60d939edef44038a9c26, O_RDWR) failed: No such file or directory (2) in /hermes/web04/b1635/pow.tillie/photogallery/zp-core/admin-globals.php on line 15

and several lines of:
Warning: Cannot modify header information - headers already sent by (output started at /hermes/web04/b1635/pow.tillie/photogallery/zp-core/admin-globals.php:15) in /hermes/web04/b1635/pow.tillie/photogallery/zp-core/admin.php on line 40

This indicates there is a problem using "sessions" on your server. Perhaps a folder has been deleted accidentally. You will need to consult with your service provider to correct this. The Zenphoto administrative interface requires sessions to function correctly.

That was it. They fixed it. Thanks!