Originally posted here by -[PM.gothtec]-
there is a dirty way of doing it without screwing around with the registry, i think
i believe all you have to do is ENABLE sharing of c: as C (or whatever the default name is), reboot and disable it. XP won't share the same partition twice, so enabling the share disables the default one, which remains off after disabling it again.

don't quote me on that one, but I believe I've seen that work...
No, if you do this in Win XP Pro, you end up with two share C$ and C. (assuming you aren't using Simple File Sharing)
In Win XP Home edition though, I don't think you have the C$ at all... (because it's limited to only allow for Simple File Sharing... I believe)