How are you starting the VM? Could you try specifying -M pc-i440fx-1.7 or -M pc-i440fx-2.0 ? With the latest upload the default became 'trusty', which could cause windows to say "this is new hardware".
How are you starting the VM? Could you try specifying -M pc-i440fx-1.7
or -M pc-i440fx-2.0 ? With the latest upload the default became
'trusty', which could cause windows to say "this is new hardware".