I have a Samsung R60+ laptop that has been running Windows 10 Tech Preview quite happily on a temporary hard drive. I've just put the original Windows 7 hard drive back into the laptop to upgrade to Windows 10 and the installer tells me that I can't upgrade because the graphics card is incompatible. IF this was true I wouldn't have expected the Tech Preview to work. Is there a way around this? I'm particularly keen to make this work as I've purchased a SSD specially to keep this laptop alive for another year or so.