From Madcrosoft UK
What is the Registry
The Registry is the heart and soul of any Windows system. It contains information that controls how your computer appears and how it behaves. Most applications today use the registry to store configuration and other important data.
When you install an application, a new registry entry 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, installing and uninstalling a number of applications, your Windows registry will contain a large number of obsolete entries. These will significantly increase the registry size and thus will slow down your computer, because Windows will need more time to load, search, and read data from the registry. Registry Cleaner V7 counteracts this by cleaning up these loose ends that potentially strangle your PC
Registry Cleaner 7 Features
# Registry Cleaner
The ultimate Registry Cleaner removes unwanted fragments left by uninstalled and software products within your system's Registry.
# Privacy Cleaner
Remove all your browsing history
64mb RAM 10mb HDD IE 5 AND ABOVE