Installing Windows 10

[Old Newbie]

Have 2 machines, both running VB. Have attempted to install Win 10 Pro RTM_x64 on each machine using the same ISO file.

Machine 1 running Win 8.1.1 (64 bit), and VBox 4.3.30 installs Win 10 without any problems.

Machine 2 (older) running Win 7 Ultimate (64 bit) and VBox 5.0.0 boots from the ISO image and then BSODs with this cryptic message:

SYSTEM_THREAD_EXCEPTION_NOT_HANDLED

Googling the message points to a display driver issue, but since I'm such a Noob at this stuff, I don't know if it's the driver in VBox 5.0.0 or the display adapter in the host machine, an NVIDIA GeForce 8800 GT.

Any suggestions appreciated.

O. N.