I'm not getting the correct resolution in VirtualBox for Windows 8. I tried to install the Guest additions but I still can see the yellow exclamation on Display drivers. Tried to manually extract and install no go.

It's Windows 8 64-bit on Windows 7 x64 VirtualBox ... Any idea?

The driver doesn't install even under Win 7 compatibility mode. VMWare Player V4 is out today. It works just fine with Win 8. See this thread. vmware player 4 (free) now out - - Windows 8 WORKS as vm