An operating system is laid down on a number of modules which make it possible for users to interact with underlying hardware. Every operating system has its own way to store configurations for different devices and users. Microsoft’s operating system organizes this information in Registry. Besides the use of registry by Windows for its own functions, 3rd party applications also utilize it. The use of registry by software may leave needless and surplus information in registry after it has been uninstalled. This problem may slow down the PC in longer run and cause some frustration.
Registry Cleaners are applications that have been designed to scan and analyze registry for left over. If problems are found, the utilities attempt to repair or delete dispensable registry items. There is no hard and fast rule to detect such registry items; so the use of registry cleaners has always been debatable. It is also highly recommended to make backup of registry or whole system which can restore the PC to an earlier status in case something undesired happens. Following is a listing of best free registry cleaners and any of them can be used conveniently in Windows 7.
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TweakNow Registry Cleaner
It is a proficient free registry cleaner to be used in Windows 7. It is fast in scanning registry with efficient algorithm to find obsolete registry items. Before making any changes to registry, it creates a back up of registry which can be utilized to restore the system. User can define rules to exclude registry items from scanning. Besides registry cleaner, it contains many other tools like Track Cleaner, Disk Cleaner and Analyzer, Startup Manager and Registry Defragmenter. It is compatible with 32 and 64 bit versions of Windows 7. (Download TweakNow Registry Cleaner)
Auslogics Registry Cleaner
It is another simple and free solution which can be used to clean and repair Registry in Windows 7. The intuitive interface guides the users to optimize registry with ease. The segments of registry which are not required can be discarded comfortably. The tool is quick at scanning and cleaning the system for better performance. It is natively supported in 32 and 64 bit versions of Windows 7. (Download Auslogics Registry Cleaner)
CCleaner
If this tool is not already installed, you are missing one of the popular freeware utilities. It has a registry cleaning component which is light while dealing with registry although CCleaner is primarily designed to clean usage tracks from PC. The option to back up registry is also liberal. The tool works flawlessly on 32 and 64 bit versions of Windows 7. (Download CCleaner)
WinUtilities Free Registry Cleaner
This free registry cleaner has an established track record and is suitable for users of Windows 7. The user can easily prohibit sections of registry by un-checking them before performing a scan. The visual interface is pretty much straight for normal users. Scanning, repairing, or restoring registry is pretty straightforward. It runs smoothly on 32 and 64 bit versions of Windows 7. (Download WinUtilities Free Registry Cleaner)
With the development of Windows operating system, the Registry module is sounder and less erring. It is cautioned to use Registry Cleaner with care in high demand scenarios. Also don’t forget to back up your full system or at least create a restore point.

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I agree with your point of view, but I also have their own ideas, such as …
Is TweakNow free to use and does it work well? My laptop runs slower and slower.