Is virus transfering prevented from the other OS when dual booting?

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http://forums.fedoraforum.org – I'm beginner to dual booting but say I get or suspect that I have a virus on Windows 8, is my Fedora partition still safe? Does it depend on what kind of virus or is fedora just completely isolated from windows at this point. I am just wondering because I'm curious and want to be extra safe (incase I need to fill out tax forms or something similarly important, I'll probably do them on fedora) (HowTos)