I have a 32-bit Ubuntu 10.10 as a host OS, VirtualBox 4.0, Windows 7 64-bit Professional as a guest OS. The laptop processor is 64-bit. When I try to load Windows 7 64-bit in VirtualBox, the error appears:
attempting to load a 64-bit application, however this CPU is not compatible with with 64-bit mode
I don't understand, the CPU is compatible with 64-bit mode, what's the problem?
Answer
I believe it's telling you VirtualBox's virtual CPU, though, is not 64-bit compatible. Is hardware virtualization enabled, and have you enabled VirtualBox's 64-bit support for the specific VM in question?
http://www.virtualbox.org/manual/ch03.html#intro-64bitguests
You need a 64-bit processor with hardware virtualization support (see the section called “Hardware vs. software virtualization”).
You must enable hardware virtualization for the particular VM for which you want 64-bit support; software virtualization is not supported for 64-bit VMs.
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