A few years ago I bought an OEM version of Windows XP. I have splatted my pc a few times and now just built one from scratch. I thought it would be simple that the old hard disk is just going to be storage but have bought a SATA drive as my main, that I could put my XP on it but keep getting notes about not being able to activate it. Legally surely I can now switch it over as long as I don't run both of them together.
Who do I need to contact or what do I need to do?