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#31
It doesn't necessarily sound like this is the same problem (assuming you're referring to the initial problem, and not the completely separate problem that I mentioned a few posts up, which was supposed to be in a separate thread).
Does Win7 show any files from your WinXP installation, such as program files, the windows folder, etc.? Or is it just your WinXP documents that you can't locate?
Drive letters (C: and D:) are just letters that the operating systems use to link to the actual drives or partitions. For example, if I boot into WinXP, C: is the partition that XP is installed on, but if I boot into Win7, C: is the partition that Win7 is installed on. That's normal behaviour.