The best registry cleaners even make a backup copy of your registry before tampering with it, so you can restore the working registry if anything goes wrong. The best registry cleaner for Windows 7, or any other operating system, takes a conservative approach to deleting registry entries. Deleting the wrong registry entry can cripple your system. You then have to decide whether to delete the entry or leave it alone. If the entry cannot be fixed the cleaner may simply delete the entry or flag it for your attention. If a bad registry entry is found, the cleaner attempts to fix it. Hence, the need to clean your registry periodically.Ī registry cleaner (sometimes called a registry booster) scans every entry in the registry to see if it is valid. In the worst case, an invalid or corrupted registry setting can prevent Windows from loading at all. Performance may suffer as Windows tries to load programs or files from locations where they no longer exist. Over time, the registry becomes cluttered with entries that are no longer valid for example, a program's entry may not be deleted when the program is uninstalled. Hardly a second passes without some alteration of the registry.

The locations and names of recent documents and Web URLs are stored in the registry. When a program is installed or un-installed, a registry setting is created or altered.

When you start your computer, the registry tells Windows what programs should be automatically started. The Windows registry is a set of databases that contain thousands of records of settings, file locations, and other information that Windows uses.

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