Can't start session for virtual machine

[coldshine]

I've got an error:

Can't start session for virtual machine.

The virtual machine 'MS DOS' has terminated unexpectedly during startup with exit code 1 (0x1). More details may be available in 'E:\VirtualBox VMs\Machines\MS DOS\Logs\VBoxHardening.log'.

Erro code: E_FAIL (0x80004005) Component: MachineWrap Interface: IMachine {b2547866-a0a1-4391-8b86-6952d82efaa0}

Host - win 7, 64bit. Guest - any vmachine (tried msdos, win xp, win 7, ubuntu and got the same error).

BUT if I start the machine in the background session and then click show (or start background session with interface) - everything works!

Tested on 5.1.10, 5.1.8, 5.1.0 and test build (5.1.11). Seems like an issue with all 5.1.x versions.

Note that 5.0.x works fine on my host.

[coldshine]

There is an error in VBoxHardening.log

c2c.a8c: supR3HardenedScreenImage/Imports: cache hit (Unknown Status -22900 (0xffffa68c)) on \Device\HarddiskVolume1\Windows\System32\user32.dll
c2c.a8c: Error (rc=0):
c2c.a8c: supR3HardenedScreenImage/Imports: cached rc=Unknown Status -22900 (0xffffa68c) fImage=1 fProtect=0x0 fAccess=0x0 cHits=16 \Device\HarddiskVolume1\Windows\System32\user32.dll

[Frank Mehnert]

What happens if you disable 3D in the VM settings?