Hi all,
Just to let you know that if you have any modalizer extensions on your Joomla 2 site and install Virtuamart, you will have some jquery conflicts and the modal window for places like "ask a question" appear as a full page. The way I managed to keep all of my modalizer settings and add Virtuamart is by
1. Unistall any Modalizer Extension
2. Reinstall (Leave all of your code in place)
That has fixed the issue of the Modal windows conflicts for me.
I hope it helps anyone in a similar situation.