Be sure to enable I/O APIC
for virtual machines that you intend to use in 64-bit mode.
This is especially true for 64-bit Windows VMs. See
. For 64-bit Windows
guests, ensure that the VM uses the
Intel networking device
because there is no 64-bit driver support for the AMD PCNet
card. See .
If you use the Create VM wizard
of , automatically uses the correct
settings for each selected 64-bit OS type. See
.