"An unauthorized change has been made to windows" RRS feed

  • Question

  • I have had Vista on my Dell for around four years and haven't installed any new hardware or software recently.

    When I turned on my computer this morning and got past login I received the error message "An unauthorized change has been made to windows". and sent me to  http://www.microsoft.com/genuine/validate/?OSV=6.0.6001.2.00010300.   where it has been "validating" for more than an hour.

    If I minimize my screen the computer screen is black. I have no access to control panel or the start button or anything. What should I do to correct this??
    Wednesday, November 9, 2011 4:41 PM


  • Hi,


    Did you change any hardware before the issue occurs? If this is the case, did you activate the system again? See Activate Windows on this computer and Activating Windows: frequently asked questions


    If the issue persists, the validation issue can be caused by several factors, such as incorrect local system settings or an incorrect Product Key.


    First, please let me know if you have visited the MGA Diagnostic webpage located at the address below and click on the “Start Diagnostics” button and follow the instructions:




    On the above website, we can test some system settings and confirm that there are no Internet Explorer (IE) settings or other factors blocking the validation process. If it was successful all results should display “Passed”, if any of them failed please follow the directions to attempt repair. Please let us know which test failed and the results of the troubleshooting performed as suggested by the web site.


    If you have accessed the site but the validation issue persists, I suggest we try the following steps to test this issue:


    Step 1: Test the issue in Clean Boot.


    After that, please restart the computer and validate the system again to check if the issue still persists.


    Step 2: Run the MGA Diagnostic Tool to troubleshoot this issue
    1. Please open Internet Explorer and visit the following link to download the MGA Diagnostic Tool:




    2. Save the "MGADiag.exe" file to the "Desktop", and then double click on the file to run the tool.
    3. Click the “Continue” button.
    4. Under the “Windows” tab, click the "Resolve" button if it is highlighted.
    5. Restart the computer and visit the following website to validate Windows again.




    Additionally, it is recommended to contact our Windows Genuine Advantage support for the email support via the following link, which is free of charge and more securer for some personally information during the validation:







    This posting is provided "AS IS" with no warranties or guarantees, and confers no rights. |Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
    • Marked as answer by Sabrina Shen Tuesday, November 15, 2011 9:36 AM
    Friday, November 11, 2011 6:42 AM