I have both Ubuntu 12.10 and Win7 installed. I use the former mostly for scientific simulations and the latter for applications.
The problem I came across with this configuration is that the simulations take quite a while, and I'm not satisfied enough with solutions like Wine to run the Windows apps while the simulation runs.
I would rather not install the simulation programs again, since it took quite an effort. So, is it possible to boot the already installed version of Ubuntu from within Windows 7 via VirtualBox or or something else?