disabled drive

[stm23]

hi, i'm attempting to install Redhat9 alongside XP (already installed).  i 
used partition magic to setup a linux partition & chose (stupidly) to disable 
the NTFS drive.  now i can no longer start XP.  does any1 know how i can 
re-enable the NTFS drive, i'm not sure how - as i can no longer access XP.
thanx, sam