If I buy a pre-built PC with Windows 7 Home Premium OEM, can I install that Windows on a separately bought SSD without any issues? Technically possible, legally possible? As far as I understand it, Microsoft says you can upgrade any PC component you want with an OEM version of Windows, except for the mainboard. Can someone confirm that? Does the retailer usually send the OEM disc with the PC? Do I get the key only? Haven't bought a pre-built in years.