Questions in regards to Bootcamp and running HeRo on Mac

[youngwayfarer]

I've done a bit of research on the forum with previous people and running HeRo on their macs (With Bootcamp) but I still have a few questions/things I'm kind of unsure of.

1) If I only want Windows on my computer to play HeRo and not to do anything else, do I have to worry about getting viruses? I was reading in an old thread a whole thing about how you can still get viruses from so and so, even if you're on the mac "side" of your computer when you have bootcamp, I didn't really understand it all.

2) Am I better off getting Windows XP or Vista? I have an old CD with Windows XP that I used on my old PC computer but my brother has Vista so I guess I have the choice, but is there any difference?

3) Is it possible to download and install all of HeRo and the Ragnarok client on a USB and just plug it into my computer with Windows running through Bootcamp and play it that way to save harddrive space?

Also if you guys have any other useful information or advice please post.