That's a very different issue. I'd suggest you ask such a question in a Q&A that is more suited for it, e.g. http://askubuntu.com/ or look for help in the Virtualbox forums: https://forums.virtualbox.org/ . But make sure to search for a similar question first. Maybe something like that here might help you: http://askubuntu.com/questions/102450/how-to-set-up-virtualbox-bridged-network-on-windows-7-host