backup Registry
The registry stores the data in a structured hierarchy of keys, subkeys, and named values. Incorrectly editing the registry may severely damage your system. Microsoft recommends that you backup the registry before you edit it.
Here are some way to backup or restores registry:
How to backup Registry Keys in Windows XP
How to Restore the Registry in Microsoft Windows 95
How to Back Up the Registry in Microsoft Windows 95
How to restore registry keys in Windows 2000
How to restore Windows XP registry
How to back up your entire Windows XP Registry
How to back up your entire Windows 2000 Registry
How to back up the registry in Windows Vista
How to back up the registry in Windows XP
How to backup and restore the Windows 7 registry
How to recover a corrupted registry that prevents Windows XP from starting
After several series of installation/uninstallation, the Windows registry becomes bigger and bigger. Here are some registry cleaner software:
Backup / Restore the windows registry - ERUNT
Display / Edit registry entries neatly : Registry Jumper
Clean up Registry - EasyCleaner
Advanced System Optimizer - Windows Registry Optimizer
Advanced Registry Optimizer - optimize your Windows registry
windows xp registry cleaner - Registry Genius
Free Registry Fix Download
Windows 2000 Registry Repair Utility