As versões do VirtualBox 2.1+ suportam convidados de 64 bits em hosts de 32 bits, assumindo que o seguinte é verdadeiro:
- You need a 64-bit processor with hardware virtualization support (see chapter 1.2, Software vs. hardware virtualization (VT-x and AMD-V), page 11).
- 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.
- If you want to use 64-bit guest support on a 32-bit host operating system, you must also select a 64-bit operating system for the particular VM. Since supporting 64 bits on 32-bit hosts incurs additional overhead, VirtualBox only enables this support upon explicit request.
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Hospedar um convidado do Windows dentro de um host Windows não deve ser um problema, portanto, contanto que você passe os três pontos, ele deve funcionar.