TweakNow RegCleaner 4.0 released

The Registry is a heart and soul of any Windows system. It contains information that controls how your Windows appears and how it behaves. Most applications today use registry to store configuration and other important data. When you install an application, a new registry entries will be created. These entries will automatically be deleted when you uninstall the application. Unfortunately, it does not always work that way. Sometimes, you will find that some applications fail to remove their own registry entries. These entries will become obsolete.

After a long period, after installing and uninstalling a lot number of applications, your Windows registry will contain a large number of obsolete entries. These will significantly increase the registry size and thus will slowdown your computer, because Windows will need more time to load, search, and read data from registry.

To keep your computer in top performance, it is recommended to periodically clean your Windows registry.

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I want the results of an independant study that compares the before and after purging--I want to know exactly the extent of the so-called slowdown caused by orphaned registry data.

Just like having lots of folders doesn't slow down explorer until you actually open up a tree node (it won't needlessly recursively search subfolders otherwise), the mere presence of unused data in the registry doesn't do anything other than waste disk space--and it's not like the registry is huge, taking into consideration today's hard drive sizes...

So, can these guys actually back up their claims? How do they guarantee that nothing uses a given registry key, and not break an app if it's wrong? If I manually create a key called HKLMSOFTWAREMyCrap, and nothing uses it, should it be purged or kept? There's just too many variables that come into play--I just can't bring myself to trust *any* registry cleaner...measuring the risk vs actual benefit...