using SUBST command upon boot

Hi,

on my XP lap-top with 40GB hard-disk, there is only one partition C: - NTFS
i need to configure d: drive (preferebly without formattnig and reinstalling
windows.)
i heard of the SUBST command that can do the task of adding d: volume that
actually points to a folder c:\myD on the original partition.

problem is the subst command should run upon startup, and if i install
programs on the virtual D: it will not be available upon services startup
only on the user-init stage, and this could cause problems.

i need the D: drive tp created as early as possible in the start-up process
preferebly be fixed.

i heard also of the linkd utility that should do the same work but better, i
downloaded it from the windows 2003 server resource kit but couldn't get it
to work on my XP machine.

is there a way to cause linkd to work on XP machine?
is there a way to persist the d: drive using linkd, subst or any other way
so it will be available upon services startup for a place for installed
programs that should be started upon system startup process?

TIA, z.