You can drill down and see exactly which registry keys will be deleted before committing to anything. The registry is backed up by default before you make any changes, and can be restored using the Rescue Center option. This registry cleaner is refreshingly simple you use checkboxes to choose which types of registry entry to scan for.

The paid version provides automatic browser cleaning, real-time monitoring and technical support, which can greatly improve system performance. The CCleaner software also comes in a paid version CCleaner Professional, but the freeware version is sufficient for most Windows registry cleanup tasks. Moreover, you can manage all your browser plug-ins, find unnecessary duplicates, clean your drivers and more. With CCleaner, you can also perform a quick or in-depth analysis of your files, disk and registry remove any program leftovers and choose which applications to run at Windows PC startup. The tool asks you whether to back up the registry before making any changes. This Piriform product is probably the best registry repair tool. This free tool can be upgraded to Glarysoft Utilities, which offer features such as registry cleaner, shortcut fixer, spyware remover, disk repair, track eraser, temporary file cleaner and startup manager. Also, whenever you clean the registry, a corresponding Undo file is generated, so you can easily revert any changes. It also offers automatic registry backup before making any changes to the Windows registry, which helps mitigate risk.

It provides a list of the errors found, and you can choose to repair particular items or automatically repair them all. In a few easy steps, you will be able to find and clear invalid entries, references and links in the registry. When you open the tool, the the registry scan process will start automatically.

Win 7 registry repair command prompt