An unauthorized change was made to your license error message

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  Q: I am receiving the following error message:
 
 "An unauthorized change was made to your license."
 To keep your system stable, you must go online and validate that your software is genuine:
 - Validate Online
 - Close
 
 How can I fix this issue?
 
 A: The most common reason for receiving this error is due to installing incompatible software in Vista. While I mention that it is the most common reason, it isn't the only reason. It can also be caused by a hard disk error. Below are troubleshooting steps that may help you in your troubleshooting efforts.
 
 Step #1:
 Uninstall the incompatible software program
 
 If you have recently installed a software program and started receiving the subject error message, try this:
 
 Restart Windows Vista
 
 Start tapping the F8 key on your keyboard before Vista starts
 
 When you come to the boot options screen, chose to start Vista in Safe Mode
 
 Press Enter
 
 Once in Safe Mode, go to Start
 
 In the Search field, type in: appwiz.cpl
 
 Select appwiz.cpl from the resulting programs list
 
 Click to highlight the software program that you would like to uninstall
 
 Select Uninstall
 
 Follow the on-screen prompts to uninstall this program from your system
 
 Restart Vista in normal mode. If this does not resolve the issue, please follow the instructions below.
 
 Step #2:
 Validate Windows
 
 To confirm that the software installed on your Windows Vista installation is compatible, click the link below. Once at the Genuine Microsoft Software website, click the "Validate Windows" button.
 
 http://www.microsoft.com/genuine
 
 If you are still receiving the error message, continue with Step #3 below.
 
 Step #3:
 Check your hard disk for errors
 
 As I had mentioned at the beginning of this article, it is possible that hard disk errors can cause this error message.