Parallels/Fusion virus cross over

[Decelerate]

I need to buy a new computer for school (Windows recommended). Since I have been a Mac guy for 5 years, I am leaning towards sticking with Mac and running windows via parallels, fusion, or bootcamp when internet explorer or other Windows native programs are needed.
However, the possibility of getting a virus while running Windows and having it corrupt files on my Mac partition has me concerned.

So other than running the requisite antivirus/spyware programs in Windows, what settings would I need to use in parallels,fusion, or bootcamp to mitigate the risk of a virus affecting things on Mac partition?

Thanks

 

[Isira]

If you don't enable folder sharing, the virus won't be able to access your OS X files.

 

[murphychris]

Run it in a VM. Boot Camp is kind of a pain to manage and change.

 

[Decelerate]

Alright. So just not enabling folder sharing should protect my Mac files. Sounds easy enough.
Thanks