Windows Vista (Business SP1) 32-bit can't be booted nor installed on an Ubuntu 64-bit host (Intel C2D) running Vbox 2.0 with VT-x/AMD-V enabled.
Bluescreen on boot with PFN_LIST_CORRUPT.
Disabling VT-x/AMD-V allows things to work. I assume this is related to the new support for 64-bit guests. XP 32-bit works fine.