I am having a really nasty problem with VirtualBox as everytime I try to install any guest OS(using ISO file as CD for installation media), the installation starts normally but as soon as it is about to start either installing to virtual hard drive or loading(e.g. as LiveFS) it causes the host system to reboot abruptly. Config is as below:

Host system: Ubuntu 12.10 64bit - Intel® Core i7-2640M CPU @ 2.80GHz × 4

Virtualbox version: 4.1.18_Ubuntu r78361

Guest OS systems tried: 32bit version of FreeBSD 9, Debian 6, Tails 0.14

VM setup

Tried to have the minimal setup necessary just in case it would avoid for each system to make sure I'd avoid conflicts, but to no avail. I've tried different values and combinations of the below but the problem still persists:

Shared Clipboard: Disabled

Show in fullscreen/seamless: Disabled

Remember runtime changes: DIsabled

Base Memory: 2048 MB

Chipset: PIIX3

IO APIC: Disabled

EFI: Disabled

Absolute Pointing device: Disabled

Processor(s): 1 CPU

PAE/NX: Disabled

VT-x/AMD-V: Disabled

Video Memory: 12 MB

3d/2d acceleration: Disabled

Storage IDE COntroller: PIIX3 (same as chipset instead of PIIX4)

Use host I/O cache: No

Audio: disabled

Network adapter: NAT

USB controller: disabled

No shared folder

Also another sideeffect of the reboot is that it appears that it does not log any information in the error log files; not making things any easier.

Please help.