Avalon is right, I remember years ago hearing tales of a virus that caused your hard drive to spin so fast it failed, but I don't see how that was possible, probably just an urban legend. A hard drive is machinery, and a virus may corrupt the data on the drive but I don't see it physically causing it to fail.
If you were to get a virus, you could always reformat that particular partition never touching your OSX install. I have had Windows on my imac since the day bootcamp came out with no issues whatsoever.