registry
Windows Registry is used as a single place to store a great deal of the information and settings for software programs, hardware devices, user preferences, operating system configurations, and much more. The registry contains a number of registry values located within registry keys, all within a registry hive. Making changes to these values and keys using Registry Editor will change the configuration that a particular value controls.
Here are some examples where making changes to registry values alters a program in some way:
How to Open the Windows Registry Editor
Registry Editor Save Key Saves Key on Wrong Computer
How to create a Default Registry Value in Registry Editor
The registry of different Windows version may have different. Here are some Different versions of Windows registry:
Windows XP Registry
Windows Vista Registry
Windows 2000 Registry
Statistics show that about 94% of computers have corrupt and possibly harmful files. On average, almost each PC will have about 150+ errors on them due to corrupt or missing registry entries. So sometimes you will need registry to be cleaned. Here are some registry tools:
Free Registry Cleaner
20 Free Registry Cleaner Tools
Registry Optimization for Windows - NTREGOPT
windows xp registry cleaner - Registry Genius
