If the update discovers a tampered file, it tries to restore the file. The update process exits silently if it detects no validation errors, activation exploits, or tampered files. However, this validation process does not affect the functionality of Windows. When this update is installed, it performs a validation process for the copy of Windows that is running on your computer. Be aware that some counterfeit copies of Windows include malware.
This update also detects any tampering attempts made to important Windows 7 system files. This update for Windows Activation Technologies helps detect validation errors and activation exploits. Microsoft describes the KB971033 update as such : Although the description is listed at the side, most users will probably not bother to read it, and assume that it's yet another important patch that fixes flaws in Windows 7 and just install it. You can see that the KB971033 update is listed as Important. If you chose to manually select updates to be installed, you should find this update listed.
Those who chose to have Windows 7 install updates automatically would have this update installed and running by now. Just as they did in Windows Vista, they have surreptitiously released an anti-hack detection update via Windows Update. It was merely a matter of time before Microsoft started cracking down on Windows 7 anti-activation exploits. ED#116 : Microsoft Silently Rolls Out Anti-Hack Update For Windows 7
