Check again the install.xml
It looks like there is something wrong - eg. the left and right columns don't have any space to the left and the right.
Normally it should look like this: http://www.board3.de/portal.php?style=1 - the portal itself shouldn't be wider than the header.
So i guess that ...

Your Portal Version: 1.0.2
Your phpBB Type: Standard phpBB3
MODs installed: No
Your knowledge: Advanced Knowledge
Boardlink: http://www.the7thhour.net/

PHP Version: 5.2.8
MySQL Version: 5.0.67

What have you done before the problem was there?


What have you already tryed to solve the ...