The  Windows registry is a database of all the information about the computer and the software installed on the computer. The main purpose of the Windows registry is to store the configuration of the different software programs installed on the computer, the hardware installed or attached to the computer, and any other special settings the user has implemented. A computer's registry is an efficient way of monitoring the different software and hardware components. For example, all the software programs are organized based on user profiles. It is also a delicate place to fiddle around without proper knowledge. One needs to be well equipped with registry handling information in order to configure/modify the computer’s registry.

The computer's registry can become corrupted by spyware and viruses. In addition, with continually installing and removing software, not all programs will remove themselves cleanly and completely from the registry.

There are two main ways to clean up a computer's registry - cleaning manually using the Windows Registry Editor, or using registry cleaning software. Manually cleaning your computer registry should only be attempted by someone who understands what the registry entries mean. Software programs can cease to function correctly if essential registry entries are removed.
The Windows Registry Editor

To manually clean your registry using the Windows Registry Editor, first create a backup of the registry, and then remove unnecessary files:

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