Looks to me that my machine is too early to make the cut for bootcamp6 but I took the chance and upgraded to win10 anyway. Now it looks like things are working except I get this exclamation mark on my GPU within win10 device manager so may I check w/ the experts here if anyone got the GPU working perfectly? Here's the setup:

early 2009 13" MacBook white w/ Core2 Duo 2.0Ghz, 4Gb DDR2-667 ram, GeForce 9400M GPU, upgraded 128Gb SSD running Yosemite 10.10.5 w/ Bootcamp 5.1.4.

I first installed win7 w/ bootcamp and subsequently updated to win7SP1. At that point, I got a perfect device manager, i.e. no warning/error. I then subsequently upgraded to win10. I think I lost 'some' functionalities such as the F10, F11, F12 volume keys are not working within win10 anymore. But I'm more concerned that within win10 Device Manager, my GPU got an exclamation mark! "A driver (service) for this device has been disabled, An alternate driver may be providing this functionality (Code 32)"

I was prompted earlier by NVidia about installation of the latest driver. But looking at device manager, my driver is still dated 29 Jun 2015....

Any clue/pointer would be much appreciated.