Admin login keeps coming back

I switched hosts a while ago and I don't believe I've tried to login to my admin page before today while I've been with my new host. My password/username was not working so I used the reset.php file. This allowed me to go into my admin section, however, whenever I click on anything, it takes me back to the admin login page. I'm running 2.2, I'd like to upgrade, but I want to backup my guestbook first.

So long as you have no uploaded images upgrading is simple. You just need to replace the files then use my upgrade script to update the database.

I tried upgrading but I got an error for Adding Thubnail Settings and for Creating Pics Tables. Also, I'm stilling getting looped to the admin login page.

Did you try my upgrade script to update the database format?

I used the script I got from here: http://www.carbonize.co.uk/upgrade.zip

I got the two errors and I am still getting looped to the admin login page.

did you upgrade your actual files from 2.2 to 2.3.3 ?

Ok. I upgraded all my files and re-ran the upgrade script. Everything was ok except for one error: Adding thumbnail settings to config table...............Error!