When I try to load the Vmware image of beta4 into VirtualBox I immediately get a "kernel panic - not syncing:VFS: Unable to mount root fs on unknown-block(8,3)" and it of course stops.

Enabled/disabled all possible settings in VirtualBox, tried loading with the Linux setting "Ubuntu", "Debian" and "Other", always the same error message.

VirtualBox version 2.1.4
Vista 32bit