It seems to me that 80% of users have encountered such a problem and we will consider its solution here. Usually, after such a message, the computer works sluggishly at times, it is also impossible to change the picture on the desktop and this inscription in the lower right corner is very annoying.
The solution is as automated as possible (it works on Windows 7, Vista, XP – it is better not to try):
1. Download the Chew WGA program
2. Boot Windows in safe mode
3. Run the program (some antivirus programs swear, so it’s better to turn them off), click Apply and reboot .