Moving Servers/Database Backup Help

[RC Attacker]

I have read the docs on moving vBulletin to another server and I still need some help.

All I want to do is move the threads, posts, and members to the new forum. I don't want to save any Admin CP settings, user groups, user ranks, styles and skins, modifications and hacks, or avatars and profile pictures.

It seems my only way (the only thing I have access to on the original forum) is the Admin CP database backup. When I try to download it to my hard drive I do not know if it is completing because it is a large database.

And when I try to backup the database to a file on the server I get this message:

Unable to write backup to file ./forumbackup-07-21-2008-fbf95.sql. This file or the directory this file is in must be world writable!

and if I add that file and chmod it 777 it says the file already exists.

All I want to do is move the threads, posts, and members to the new forum. I don't want to save any Admin CP settings, user groups, user ranks, styles and skins, modifications and hacks, or avatars and profile pictures.

In order to get only those three things successfully onto my new forum, which tables do I need to select yes to when downloading the database to my computer? And after I do that where do I upload it to on the new forum?