Powerquest partition magic should convert from NTFS back to Fat 32 (and vice versa) but obviously you need to get the HDD recognised so maybe put it back in your old PC? Of course you could have kept the two HDD on the same PC.
I have installed a new HDD onto a PC using XP pro.
I removed the old HDD and put it into my lower grade PC running 98SE. The bios recognises the HDD but the OS dosen't. Got a format system disc but the drive is not recognised in DOS either. Fdisk dosn't find it either. I presume that this is because the HDD is NTFS rather than FAT32. What is the best way of formating the HDD for use on my 98SE PC. Any advise will be gratefully appreciated. Thank You.