I would suspect that any system not mentioned would be affected. So just keep the anti virus programs up to date. I have largely switched to MAC now but still have my Microsoft XP which has always functioned well for me. However, because my system is close to 6 years old and getting a little cranky, I have a new Mac desktop with my faithful ol’ PC right near by for the one big project I have had going for hears..genealogy with Family Tree Maker which is not Mac compatible...so I guess I am bilingual : )
You could always convert your Windows machine into a VM and run it on your Mac. "VMWare Converter" works great for converting live running physical machines into VMs. It takes a little while to run, and can import the target machine from across the network into your VMWare setup.