security within virtualbox
Right now my main system is Ubuntu Linux. However, for another computer that sadly must run windows, I bought Norton Internet Security. It allows me to freely and legally install it on 3 computers. However, it's my only windows computer.
Here's my question. I run windows 7 in VirtualBox. Would there be any point installing Norton on the Windows 7 virtual machine? I know how much a program like that slows down your computer, one of the many reasons I switched to linux. If I use the internet in my virtual machine, would the security flaws in windows allows someone to acess only the VM, or would it potentially allow them access to my linux system? (It would be ironic if windows was the single security flaw in my linux system.)