what is oem xp i may have to buy a new one because the one that came with my parents hp doesnt have the cd key so what is oem windows xp as advertised on new egg http://www.newegg.com/app/ViewProduct.asp?submit=manufactory&catalog=368&manufactory=1149&DEPA=0 and what does it mean have to be purchesed with hardware i already got it all so would they send it to me, or should i purches retail if i have to? and this is on a new computer will that work?