Without the exclamation point prefix, if the RunOnce operation fails, the associated program will not be asked to run the next time you start the computer.
By default, these keys are ignored when the computer is started in Safe Mode. A program that is run from any of these keys should not write to the key during its execution because this will interfere with the execution of other programs registered under the key. Applications should use the RunOnce key only for transient conditions, such as to complete application setup.
An application must not continually recreate entries under RunOnce because this will interfere with Windows Setup. Skip to main content. This browser is no longer supported. This article describes the Windows Registry Checker tool.
Windows Registry Checker automatically scans the system registry for invalid entries and empty data blocks when it is started. If invalid registry entries are detected, Windows Registry Checker automatically restores a previous day's backup. If no backups are available, Windows Registry Checker tries to make repairs to the registry. If the registry contains more than KB of empty data blocks, Windows Registry Checker automatically optimizes it.
Windows Setup runs the Windows Registry Checker tool to verify the integrity of the existing registry before it performs an upgrade. If it detects registry damage, it tries to fix it automatically.
The protected-mode version of the Windows Registry Checker tool Scanregw. If invalid entries are detected, it refers to the real-mode version of the Windows Registry Checker tool Scanreg.
You can configure Windows Registry Checker with a Scanreg. Settings that you can configure include:. For additional information about the Scanreg. When you do so, you can choose up to five registry backup files listed for you to restore.
Right-click the file that you want to restore, click Extract, and then choose the folder where the new file is to be placed. Microsoft recommends that you place the file in your Temp folder.
Copy the file that you extracted to the appropriate folder. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback? Caution Don't edit the registry directly unless you have no alternative.
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