I work at a school and we recently got three IBM think pad 9457 laptops as a gift. These laptops had been used by the military and had the hard drives removed. I need to get them up and running. I don't have the recovery discs that came with the original units. Besides buying and installing the hard drives what else do I need to do to get it working? Do I need to buy windows and if so can I buy one and install on multiple machines? What is the best and cheapest way to get these working.