Site hacked need help

[teamsupra]

Site was hacked running an older build of 3.8.x. SO I deleted all files and upgraded to a later Vbulletin. But the hacked index is still here. When I try to go to the admincp and click login I get redirected to that hacked index. I assume it is the Style that was hacked. So the question is since I have no way to get into admincp how can I revert it to the default style I just installed by doing the upgrade?

Any help would be greatly appreciated.

[BirdOPrey5]

I know you can manually change the style id in the user table in phpmyadmin, maybe if you change it to the default style id it would work?