Change/ Move System Partition

Here is my scenario:

Had 1 60 gig hdd, primary on IDE1 (C. I added a new 250 gig SATA drive,
installed a fresh copy of XP on the SATA drive (D. Now I want to use the
IDE drive for other purposes, but I cannot because XP still identifies C: it
as the system partition. It does see the D: drive as a boot partition and I
have set D as active.

XP and all of my apps/ data are now on the SATA drive, so the IDE isn't used
for anything except booting. I have already tried copying boot.ini, ntldr and
ntdetect to D; disabled the IDE drive in the BIOS / disconnected the IDE
cable; and running bootcfg /repair from the recovery console, but I receive
an error stating windows could not find the files to load the OS. (I was able
to boot again after re-enabling the IDE drive).

Can I set D: as the system partition? Will I need to format the MBR/ run
fixboot?