Microsoft, for obvious reasons, has updated the Genuine Windows Validation. The new version is 1.4.389.0 (456KB) and it works completely different than previous versions. You have to download the EXE file (GenuineCheck.exe) in Step 1 and then run it. The EXE returns a validation code that you have to provide the Microsoft web site (Step 2). I guess this means I won't be able to slipstream LegitCheckControl.dll any longer (it's worth noting, however, that both files are the same version).