How to use Windows Registry Checker Tool

When you start your computer effectively, the Windows Registry Checker tool (Scanreg.exe) creates a backup of system files and registry configuration information (including user account information, protocol bindings, software program settings, and user preferences) once daily. Files that Windows Registry Checker backs up contain System.dat, User.dat, System.ini, and Win.ini. This article describes the Windows Registry Checker tool. Windows Registry Checker routinely 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. This is equivalent to running the scanreg /autorun command from a command prompt. If no backups are available, Windows Registry Checker tries to make repairs to the registry. This is equal to running the scanreg /fix command from a command prompt. If the registry contains more than 500 KB of empty data blocks, Windows Registry Checker automatically optimizes it. Windows Setup runs the Windows Registry Checker tool to verify the reliability of the existing registry before it performs an upgrade. If it detects registry harm, it tries to fix it automatically. The protected-mode edition of the Windows Registry Checker tool (Scanregw.exe) can create a backup of the system files and scan the registry for unacceptable entries. If invalid entries are detected, it refers to the real-mode version of the Windows Registry Checker tool (Scanreg.exe) for a resolution. You can arrange Windows Registry Checker with a Scanreg.ini file. Settings that you can configure include:
• Enabling or disabling the tool
• The number of backups maintained (no more than five is recommended)
• The location of the backup folder
• Settings to add additional files to the backup set
To use the Windows Registry Checker tool with the /restore parameter, you must run the tool from a command prompt running exterior of Windows. When you do so, you can choose up to five registry backup files listed for you to restore if your registry contains an entry that references a file (such as a .vxd file) that no longer exists, it is not repaired by Windows Registry Checker. Such errors are not typically damaging, and you can manually remove the entry. The quantity of conventional memory that is required by Windows Registry Checker is determined by the size of your registry. Windows Registry Checker may require 580 KB or more of free conventional memory to complete the repair process. If you encounter an “Out of Memory” error message, optimize your free conventional memory.

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