vBulletin Upgrade Problem Fix

I just updated my forum from v3.7 to v4.2.0 Patch Level 3, once the update was complete, I was getting these errors while trying to access the forum: Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: quick_mood_change_by_sniper in [path]/includes/[login to view URL] on line 4734 Warning: array_merge() [function.array-merge]: Argument #1 is not an array in [path]/includes/[login to view URL](1419) : eval()'d code on line 6 Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: welcome_headers in [path]/includes/[login to view URL] on line 4734 Fatal error: Call to a member function hide_errors() on a non-object in /home/talkabo/public_html/includes/[login to view URL](430) : eval()'d code on line 490 So then I added this line to [login to view URL] file: define('DISABLE_HOOKS', true); and the forum was working again. But now I am unable to access the admincp here: [login to view URL] Now all I get is a blank white page with "Page not found" written when I try to open the admincp. So I need someone who can help me fix this. It's most probably some issue with a previous plugin and/or the .htaccess file. Please ONLY bid if you are HIHGLY experienced in troubleshooting vBulletin.