without you posting errors it is hard to assist. The install is pretty simple you upload the files and run the vbgallery_install.php file and select install.
Now if you have hacks and such installed that could potentially mess up things and is not indicative of anything wrong with our software. We work with default vbulletin install and is tested and many customers run the software.
if you would like help in finding out your issue please post or email information to assist.