Get a completely idencital harddisk that works, remove the harddisk "motherboard" (the green print on the back) and attach it on the broken harddisk. There are firmware risks involved and you could end up with two broken harddisks, but if the data is that important i'm sure you can handle the risk.
Also does anyone know were I can go to get a free Version of Windows Xp Pro. with the product key?????
Go to a computer shop, give the shop droid a wad of dollars and he will be able to give you XP in return with an entirely legal product key.