Problem installing Vista 64bit with VirtualBox on a Vista 64bits

Posted on 2009-07-08
Last Modified: 2013-11-29
I want to configure a Dev VM on my Windows Vista 64. But the installation shows the following error:
Attempting to load a 64-bit application, however this CPU is not compatible with 64-bit mode.

I have windows Vista 64 bits, but it seems like VirtualBox is defining the VM with a 32bits processor.

Question by:jjcamachosanchez
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Accepted Solution

Pete_Zed earned 500 total points
ID: 24808368
It seems that you need a EM64T VT-capable processor to be able to load a 64 bit OS under a virtual machine.

For VMware, there is a utility and docs to look at here:

Check you BIOS to see if the VT option has been disabled. Enable it if at all possible.

Expert Comment

ID: 24808475
Select Windows 7 (x64) as Operation System when configuring the VM

Expert Comment

ID: 24808511
Sorry should say use Windows Vista (x64) as Version
I'm using VirtualBox in german
Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.


Expert Comment

ID: 24808596
Looking on the VirtualBox web site, it states this for running 64 bit guest OS's:

64-bit-VT or AMD-V capable CPU
Ensure AMD-V is enabled in BIOS

Author Comment

ID: 24809291
My VirtualBox don't have any 64 bits OS Option

I'm Ussing 3.0.0 r49315

Author Closing Comment

ID: 31601250

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