Alright what you need to do is upload tools.php in your admincp and then run it in your url
www.viciadosnosexo.com/admincp/tools.php and it will make you put your vb customer number. Now click restore admin access and with a new account that you have made and it will give you full admin access then go to admin control panel log find his IP make a .htaccess file in your root forum directory and put
[CODE]deny from xxx.xxx.xxx.xxx[/CODE
Now you must find out how he got in I recommend
https://vborg.vbsupport.ru/showthread.php?t=242034
https://vborg.vbsupport.ru/showthread.php?t=224053&highlight=security+audit
These should do the trick if you still feel insecure or want more advice please feel free to message me.