Windows 8.1 64-bit problem

[Bednic]

Hi,

I have problem with virtual box. When I install update on Windows 8.1, VM throw the error, that it can support 64-bit processors and use only 32 bit. So now every system what I want emulate must by 32-bit, but before on Windows 8 was possible host 64-bit systems.

[mpack]

Make sure you select a 64bit template in <vm settings>|General|Basic|Version, e.g. for a Win7-64 VM be sure this says "Windows 7 (64 bit)" and does not just say "Windows 7".

Also, on Windows 8 hosts you must ensure that Hyper-v is not running in the background. However this issue (if present) would have been present before the VirtualBox update too, so cannot have been caused by updating.

[BackSlap]

Try disabling the Windows feature "Hyper-V". It solved the problem for me.