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The computer screen is blue, so is exiting AI, and you see the prompt in the lower right corner to a

1.This is because the system is not activated, right-click "Computer" on the desktop to open the properties; enter the product id and the desktop watermark will disappear after activation.

Of course, you can also use Windows activation tool to activate

2. The activation file of the system is lost, you can use the next activation tool from the Internet, just agitate. Can also be solved by reinstalling the system