Windows 10 is not officially supported on systems this old; operation and driver support could be lacking.
Oh c'mon with new windows drivers are not a problem. Why W10 x86 does boot, why W8 x64 does boot.
I tested the DVD installer to test if was good on an older motherboard and worked fine
I know it may be a problem with a W10 x64 driver but c'mon the DVD installer didn't even boot
As Pearson mention above Windows 10 is not supported for this motherboard, if you were able to install Windows 10 x86 good for you but please be aware that there are no drivers or any support for this system.