is that even possible? As you may know, x64 microsoft system cannot ensure sandboxes/VM isolation.
The problem is that a stock Windows kernel does not provide all the facilities necessary to implement a security solution such as Sandboxie. On 32-bit Windows, Sandboxie can dynamically enhance the Windows kernel to provide the missing functionality. This was not initially possible on 64-bit Windows, due to the Kernel Patch Protection feature.
So, can I virtualise a Windows 7 32bits inside my windows x64 then put sanboxie inside this virtualised windows 7 32 bits?
sandboxie---[no leak]--->windows 7 32 bits------[leak possible]----->windows 7 x64