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Thanks PerryG, it is now working. It was a wild ride though. When I first turned on 3d acceleration, then restarted and tried to install the Guest Additions, the screen went black as before, but it hung there for several minutes without rebooting. When I shut it down and tried to restart it, it woul...

PS, both host and guest are 64 bit versions.

I have VirtualBox 4.3.18 running on a Windows 7 Pro Host. My guest is Windows 10 Technical Preview, and I cannot get the Guest Additions to install. The installer starts, seems to make some progress, but then the guest screen goes black, sometimes with a green stripe across the top, then reboots. Af...