Windows 8 (64 bit) keeps freezing on shutdown

[sbwc89f]

I'm trying to install Windows 8 64 bit in a VirtualBox 4.1.2_Ubuntu r77245 virtual machine running on Ubuntu 12.04 LTS Precise 64 bit. I have allocated all 4 cores and 4096 MB RAM to the VM, enabled 3D, I/O APIC and PAE/NX and I'm using an MT server network adapter. Basically it works fine, but in 90% of the cases the guest OS just freezes when I'm trying to shut it down. It hangs on the Windows shutdown message. I have tried disabling PAE/NX, 3D, and I've also tried using Virtualbox 4.2 and the standard network adapter. No change.

[Frank Mehnert]

Please attach the VBox.log file of such a hanging VM session.