Why not just put it back in to original pc and do XP Repair...that will keep data and files and only make you re do any added Windows Service packs and updates.
http://www.michaelstevenstech.com/XPrepairinstall.htm
Bear in mind if the drive is old and still would not boot but can be seen as a secondary drive, it could also be the drive is dying. It takes a lot more to boot than to read.
http://www.michaelstevenstech.com/XPrepairinstall.htm
Bear in mind if the drive is old and still would not boot but can be seen as a secondary drive, it could also be the drive is dying. It takes a lot more to boot than to read.