Authentication of the Windows operating system (Windows product activation) is a procedure that checks for the original files in the operating system and the license itself (including the key that was entered when installing the OS). If the operating system has not passed such a test, the user is significantly reduced capabilities when working with the computer. Usually when the operating system is not checked in the far right corner of the desktop a message appears.

The most popular way

There are several reasons for the emergence of such a message and several ways to solve it. First, not all PC users can afford to buy the licensed version of the operating system as one drive may cost more than five thousand rubles. If you do not already have a licensed copy, you first need to disable the OS upgrade. If, however, this service has not been disconnected in time and appeared a black screen indicating that the copy of Windows did not pass authentication, then you need to uninstall the updates: KB971033 and KB915597. In order to find them and to delete, click the right mouse button on "My computer" and from the context menu select "Properties". In the properties the user should choose "Windows update" and go to the tab "Installed updates". There will be a list of all updates that have ever been installed and used to this day. With the help of the search should find messages like: "Microsoft Windows Update KB915597" and "Update for Microsoft Windows KB971033". It is worth noting that the first update uses the standard Windows Defender (Widnows Defender), which is similar to antivirus software. These updates need to select and delete using the appropriate buttons.

Disable services and opportunities FOR special

In addition, the problem may be in the service sppsvc. As a result of her need to find and disable. This can be done in the menu "Administration", which is located in "control Panel". When the window opens the "administrative tools", you need to go to the tab "Services" and use search to find sppsvc. When it is found, it should be off (the Stop button). As a result, you must restart the computer and the problem should be solved.

It should be noted that there is a special program, which allows you to remove Windows activation window - RemoveWAT21. This small program capable to solve an urgent problem in all possible ways (of which there are many). She can either work with updates, or with registry etc in order to get rid of the activation window, you only need to download the RemoveWAT21 and click a special button "RemoveWAT". After the computer restarts, the activation window of the operating system will disappear. If necessary, you can restore the original data using the button "Restore WAT".