virtualbox.org

I had a VM with Windows 2008 server working with image deploying over a windows 7 x64 host.
After upgradind to the windows 8 x64 final from Microsoft Action Subscription I can't get machines to boot from PXE anymore. Even if the virtual machine is working well over network on other services (web, file server...)
Tried to uninstall, reinstall, upgrade but still not working.
I really don't know what to do next.
Any ideias ?

PS: Bridge network using virtualbox - Intel Pro/1000 MT desktop adapter used - promiscuous - all

Windows 8 is not a supported host, hence discussion is currently limited to a single Win8 (as a host) thread.