|mmm - Let's go slowly here...|
So can you explain a little more clearly please?
You had two drives; the first physical drive was Master and had only a Primary partition with XP installed; and a second physical drive which was a slave?
Which drive did you reformat?
Did you leave both drives installed as they were before you had problems; and again which drive was formatted?
Also have you re-installed the operating system again as well as reformatting?
And where was XP installed originally; was it on the Master (first physical) drive?
Are you also saying you now have to versions/copies of XP installed; one each drive?