Windows 7 OEM Upgrade Tags: Windows 7 Computers OEM Last response: June 1, 2010 12:34 PM in Windows 7 Share Scib June 1, 2010 8:52:01 AM This is prob a silly question but I currently have Windows 7 Professional 64Bit installed on my computer. If I were to buy a fresh copy of Windows 7 Ultimate would that free up the Windows 7 Professional Serial? Best Regards Scott More about : windows oem upgrade Emerald a b $ Windows 7 June 1, 2010 12:34:51 PM It will only free it up if it is a retail version. OEM versions are tied to the motherboard that they are first installed on. m 0 l Can't find your answer ? Ask ! Publish Read discussions in other Windows 7 categories Configuration Customization Drivers Security Laptops !