OEM software isnt Microsofts problem, ya need to contact HP but they might charge u for another disc. OEM stuff is sold to manufacturers to do what they want with so its not MS's responsibility If ya contact MS they will forward ya on to another company for a disc, but it will cost ya a fortune. Also keys work for a certain range of discs i.e ya couldnt use an SP1 key with an SP2 disc. Most OEM discs are BIOS dependant so if ya know someone with a similar brand pc, then ya might hit on lucky