This is not something that you have a choice about if I understand your question correctly.
You have to install (update) drivers in Windows. When you update a driver, you are not given a choice as to where to do it like when you install a program.
You definitely have a choice as to where to download and store the drivers if you choose to do so. But, when you update a driver, it happens on the partition that contains XP and you have no say in that as far as I know.