I must help!
 

Someone hacked my Admin useraccount!
How can I make it to be back?

Import a backup of your database, is one way (and may be needed depending on what they did). Or, create a new user and then upload the tools.php file to change the user to an admin and then put things right that way.

ok how can I change the user to be admin?
Where is the Tools.php?

tools.php is in your do_not_upload folder that came with your vbulletin installation. If you don't have it, you will have to redownload it from vbulletin.com in the members area.

ok i will see it now.
Edited:
shit he removed all my database.
ok I have a backup I will import it tommorow.
how can I upload vbulletin.sql file?

I suggest your read and implement each of the suggestions listed here - How To Make My Forums More Secure

Regarding your database -
From the manual:
Backing Up The Database via SSH/Telnet or
Backing Up The Database via phpMyAdmin

Restoring The Database via SSH/Telnet or
Restoring The Database via phpMyAdmin

If you don't have shell access, some people have also reported success with these scripts:
MySQLDumper
MySQLHotxcopy
Bigdump

ok i'll read.
can you tell me how can i import .sql file to my database?
I MUST HELP!!!

Edited:
ok I found tools.php
now i wil restore my admin acc.
Can you answer:
Can I to prosecute who hacked my forum?
If yes tommorw i will call the police :)

I don't know how you can prosecute. You can probably do a google search on the issue.