You can't -- if not to reinstall the system in whole, as it is said
already. See:
"HOW TO Change the System Boot Drive Letter in Windows"
http://support.microsoft.com/default.aspx?scid=kb;EN-US;q223188
<quote>
Do not use the procedure that is described in this article to change a
drive on a computer where the drive letter has not changed. If you do
so, you may not be able to start your operating system. Follow the
procedure that is described in this article only to recover from a drive
letter change, not to change an existing computer drive to something
else. Back up your registry keys before you make this change.
</quote>
But if you have the logical disks on the same HDD -- it is possible not
to reinstall WinXP, but change the letter of XD card reader (Control
Panel -- Administrative Tools -- Computer Management -- Storage -- Disk
Management) to something else, than change the letter of one of that
disks (if it has no programs installed on it) to C: and create the empty
"Windows" and "Program Files" folders on it -- what is enough usually to
have no problems with installation and other programs.
BTW, my both home computers use the letters (these letters are
different) other than C: for WinXP, but with the mentioned folders on C:
drive -- with no problems at all for several years.
--
Mikhail Zhilin
http://www.aha.ru/~mwz
Sorry, no technical support by e-mail.
Please reply to the newsgroups only.
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