virtualbox.org

Hi,

I have a "white box" type machine with an Asus motherboard and BIOS and an Intel i5 4 core processor. I am using VB version 4.3.10 r93012. It installs without error. But it seems to think it is on a 32 bit system. I enabled VT-x in the BIOS and Microsoft's Virtual PC sees it as a 64 bit with VT-x. VB won't allow me to select the number of cores to use and it doesn't list any 64 bit guest systems under the "New" menu. Does anyone have any ideas I could try? Thank you in advance.

1) 64-bit guests need hardware-virtualzation enabled in the hosts bios.
2) when creating the 64-bit guest you must select 64-bit in General -> Basic -> version.
3) If running Windows as host you must make sure hyper-v or xp mode is not enabled on the host. MS does not play well and wants it all.

Thank you perryg for your quick response. The problem is that under "general", "basic","version", all it lists are OS's with (32 bit) as the description. I am a little confused by #3, do you mean if I use Windows 7 as a "guest" OS then I should go into my BIOS and disable the "VT" support? Thanks again.

Not at all. Please read the red letter words again. If the host has hyper-v or xp mode the VMX flag will not exist for VirtualBox since those two hypervisors take complete control of the option.