Thanks for everyone's responses. For now I'm just gonna stick with having to reboot my computer to switch between ubuntu and windows 7 and, when I have a little time, try and find a simple way to try and share files between the two. I would try black3agl3's suggestion but this is the 1st time I've ever done a partition which was completely done by the Wubi installer so I would have no idea how to do make a 3rd.

But when I am a little less busy I am going to use y'all's suggestions to actually learn what virtualBox is and how to correctly use it and install it and everything.