
You can configure Windows Registry Checker with a Scanreg.ini file. If invalid entries are detected, it refers to the real-mode version of the Windows Registry Checker tool (Scanreg.exe) for a resolution. The protected-mode version of the Windows Registry Checker tool (Scanregw.exe) can create a backup of the system files and scan the registry for invalid entries. If it detects registry damage, it tries to fix it automatically. Windows Setup runs the Windows Registry Checker tool to verify the integrity of the existing registry before it performs an upgrade. If the registry contains more than 500 KB of empty data blocks, Windows Registry Checker automatically optimizes it. This is equivalent to running the scanreg /fix command from a command prompt. If no backups are available, Windows Registry Checker tries to make repairs to the registry. This is equivalent to running the scanreg /autorun command from a command prompt. If invalid registry entries are detected, Windows Registry Checker automatically restores a previous day's backup. Windows Registry Checker automatically scans the system registry for invalid entries and empty data blocks when it is started. This article describes the Windows Registry Checker tool. Files that Windows Registry Checker backs up include System.dat, User.dat, System.ini, and Win.ini.



Registry problems can occur for many reasons, including references left behind after uninstallations, incorrect software removal, missing or corrupt hardware drivers, or orphaned start-up programs. Problems with the Windows system registry are a common cause of Windows crashes and error messages. Free Registry Cleaner is a registry repair utility that allows you to safely clean and repair Windows system registry issues in a few mouse clicks.
