Vbulleting forum hacked - Please help

[skyyjet]

Hi

Recently my vbulletin was hacked.
The hacker encoded his code in all template files and also changed admin password.

Admin area login page after deleting encoded hackers code from templates is displaying blank page.

I uploaded default style using tools.php but site is not opening.

I believe I need to set it a new default style through phpmyadmin as I cannot access admin area of vbulletin.

So I need to know 2 things:

1 - How can we upload styles using phpmyadmin
2 - How to set any existing style or the default vbulletin style as default/main working style through phpmyadmin.

I believe doing this might help to access admin area.

Thanks
Skyjet