Need help with rescue vB5 --> vB4

[samroza]

We got upgraded from vB4 to vB5 and it has not been good. My userbase has (rightfully so) wandered off due to glitches, bugs, and overall poor development from vBulletin.

I have copied the 'vb4archive' files that they made prior to installing vB5 into a new directory (/forum2).
I have created a new database and restored a .sql file from prior to the "upgrade" into the ned db
I set the db name/user/pass in includes/config.php to the correct info

When I go to domain.com/forum2/forum.php I see a page with no/broken style, a login screen and other various unstlyed text. If I try to log in, it redirects me to the existing /forum. So it seems that I need a way to change the baseurl.

If I go to /forum2/admincp, I am presented with the vB4 admincp login screen. If I log in, it redirects to domain.com/forum2/login.php?do=login and then back to admincp. In spite of the address bar saying 'forum2', I actually think that's a redirect to /forum's login script, but I could be wrong.

So, should I set vB4 software up again so that all the base urls and whatnot are correct? Or is there a setting somewhere for me to do that without a full reinstall?