According to this post on Microsoft a registry key is holding you back : just navigate to HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001 (OR 0000) and change the specific KEY FeatureTestControl value to fb20...
On this Sony VPCS11FM laptop it was 0000, FWIW.