I just bought Asus notebook with pre-installed Vista Home Premium.
I successfully installed and used Win XP guest system for some time. However, when trying to install Ubuntu or OpenSolaris, Vista host gets completely hanged, not responding to any key or mouse combination.
Host hangs during first few seconds of Ubuntu guest installation procedure, and very soon after start of OpenSolaris installation procedure. Installation boot loader menu seems to be working on both guests, until I choose to install the sys. Also, if I choose to boot Ubuntu as live CD, system hangs also. When I choose "Check CD for defects" from Ubuntu boot loader menu, system hags also (!), although the ISO images are accessible, and their MD5 checksums are OK, just as WinXP installation ISO.
I need your help to resolve this issue, since I really need these systems as guests for my studies. I love VirtualBox and really do not want to switch to vmware, unless this issue will force me to.
If you need any additional info, please say.

