Because of something YOU did Windows has become highly unstable. If you'd listened to Windows instead of doing what you'd like you may have avoided it. The system is going to become critical very shortly. To avoid this you can restart Windows or, if this warning has appeared repeatedly you can use the emergency "Terminate" function.
* Restart Windows_
Select an option by clicking on it. If your pointer has frozen or is not responding to communication, please select the "Terminate" option.