Call the main system menu by pressing the "start" button and click "control Panel". Open the link "Programs" and expand "View installed updates" under "Programs and features". Find the update to be removed in the list dialog that appears, and call its context menu by right-clicking the mouse. Enter the command "Delete" and click "Yes" in the opened window of the query system. Wait until the process is complete.
If we are talking about the update SP3 for Windows XP, use the removal option in the hidden system folder $NTServicePackUninstall$. To do this, return to the main menu "start" and go to "Run". Print
in the Open box, and run the utility wizard to remove the service pack by pressing the OK button. Confirm the selected action by pressing the "Next" button in the main window of the wizard, and follow all of his recommendations.
One of the most common ways to cancel the update installed, you can consider using the restore system. To use this method make sure that the computer has been rebooted at least once after installing the update and bring up the main system menu by pressing the "start" button. Go to the Run dialog and type
in the Open box. Confirm the utility starts by pressing the OK button, and select the option "Restore an earlier state of the computer" in the dialog box. Confirm the selected action by pressing the "Next" button, and select the date to roll back the system. Save the made changes by pressing the "Next" button and follow all the recommendations of the recovery wizard. Restart the computer to apply the changes.