dual boot/xp/7100

I'm a bit worried about this as the two drives are visable at all times (regardless of if it's xp or 7)

What I'm worried about specifically is that how likely will one program from one side influence the other. I've already had a search bring up stuff from the opposite drive when I specifically asked for the opposite!!!!! (and double checked of course)

Anyone else seen something like this? Is there something that I need to do to stop that from happening?

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