If you are trying to upgrade your operating system then, the Windows Setup program will run the Registry Checker tool to check the integrity of the existing registry. If more than 500 KB of empty data blocks exist in the registry, then the Registry Checker tool optimizes the registry to remove these empty blocks. In the absence of a registry backup, the tool tries to repair the registry to make it error free. If the tool detects invalid registry entries, it replaces the current registry with the registry backed up a day before. When you run the Registry Checker tool, it automatically scans the registry for invalid and malicious entries and empty data blocks. These software usually work by entering malicious entries into the registry, which in turn, increase the number of errors on your system. ![]() If you actively use the Internet on a daily basis, then it is quite likely that malicious software such as virus, Trojan, Spyware, and adware have been downloaded to your system while you are online. But, there are a few that leave empty data spaces behind, thereby causing registry fragmentation. ![]() Most of these values are removed from the registry when they are no longer required. System.dat, User.dat, System.ini, and Win.ini are some of the important files that the Registry Checker tool backs up everyday.Įvery time you install or uninstall an application, browse the Web, or even change the Window size, there are some values added to the registry. The Windows Registry Checker tool (scanreg.exe) is included in Microsoft Windows 98 and Windows ME operating systems to create backups of system files and the registry once a day.
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