It was merely a matter of time before Microsoft started cracking down on Windows 7 anti-activation exploits. Just as they did in Windows Vista, they have surreptitiously released an anti-hack detection update via Windows Update. Those who chose to have Windows 7 install updates automatically would have this update installed and running by now. If you chose to manually select updates to be installed, you should find this update listed. In this update, we added a list of hacks that KB971033 does not affect.