I've got a bought vB forums but actually I used them for test till now, I took them from the FTP (old forums) and when I put it to the main forums it redirected me onto the old forums.

What do I do to configure this? Also, how do I make them to load from zero, without threads, categories and other shit.

Please help me.

Look where you are "SA-MP Forums > SA-MP Server > Server Support". This thread doesn't belong in this section, post it in the "Everything and Nothing" board. Or go ask this on vBulletin's forums, they are self-obligated to give you assistence.

Drop all the tables in the MySQL database to clear threads and posts etc...