Free Registry Defragment Tools

Glary Utilities offers numerous powerful and easy-to-use system tools and utilities to fix, speed up, maintain and protect your PC.
It allows you to clean common system junk files, as well as invalid registry entries and Internet traces. You can manage and delete browser add-ons, analyze disk space usage and find duplicate files. You can also view and manage installed shell extensions, encrypt your files from unauthorized access and use, split large files into smaller manageable files and then rejoin them. Furthermore, Glary Utilities includes the options to optimize memory, find, fix, or remove broken Windows shortcuts, manage the programs that start at Windows startup and uninstall software. Other features include secure file deletion, an Empty Folder finder and more.

Easy to use, doesn't hog resources

Advanced SystemCare Free (formerly Advanced WindowsCare Personal) has a one-click approach to help protect, repair, clean, and optimize your PC. With over 50 MILLION downloads since 2006, this fantastic, award-winning, free PC repair software is a "must-have" tool for your computer. 100% safe with no adware, spyware, or viruses; a PC maintenance program that’s incredibly easy to use.
Why waste money on expensive "registry cleaners" to fix your PC when Advanced SystemCare Free will repair, tune, and maintain it for you – for free!
Key Benefits

* Ultimate Speeding Up with New Added Turbo Boost
Advanced SystemCare is built with Turbo Boost to speed up PC by shutting down unnecessary background processes, cleaning RAM, and intensifying processor performance.
* View What Has Been Optimized
New version can let you view log files of what have been optimized in your system.
* Uninstall Unnecessary Application and Remove Leftover Files
Speed up PC by removing installed files and entries that were left on the system with built-in tool Advanced Uninstaller.
* Enjoy That New PC Feeling Again
Whatever version of Windows you’re running, enjoy that “good as new” speed usually only experienced on a brand new PC.
* Powerful Hard Drive Defragmentation
Fast, powerfully and incredibly effective Disk Defrag function to defragment hard drives - up to 10 times faster than other defragmentation tools.
* Next-generation Free Windows XP/Vista/7 Registry Cleaner and System Optimization
Safely cleans registry junks, compacts registry bloat and defragments the registry for blistering-fast performance.
* Defends PC Security with Extra Protection
Secure your PC – quickly and easily. Scans and removes spyware and adware using up-to-date definition files. Prevents spyware, hackers and hijackers from installing malicious items on your computer. Erases and updates your PC’s activity history with this powerful free XP registry cleaner. Security and Privacy assured!
* Quick and Extensive Clean-up for Hard Drives
Boosts your system’s performance with Advanced SystemCare Free, the powerful free XP registry cleaner by cleaning missing files, destroying unwanted files, deleting obsolete files, and removing junk files. Supports deep-cleansing of more than 50 types of junk files.
* Speeds Up PC Performance and Internet Access
Tunes up Windows by releasing the built-in power of your system. Dramatically improves both system and Internet performance by up to 400%.
* Fixes Multiple System Errors
More than a mere free XP registry cleaner – keeps your PC stably and running at peak efficiency.
* Extremely Easy to Use
Completes its work with just one click! Scans, repairs and secures your PC in one minute.
* Safe and Free
100% free with no spyware or adware! Advanced SystemCare Free is a safe and trusted PC protection and maintenance solution from a leading software vendor.

this is ideal if you like a 1 click automated service, it also has a built-in registry defragmenter & cleaner, as well as disk cleaner, removes junk, checks and removes spyware, can optimize your system automatically

Quicksys RegDefrag is a freeware utility to defrag registry. Quicksys RegDefrag is small, clear and easy. Registry data is constantly being written to and removed during a normal Windows operation. Over time this data becomes fragmented.
Quicksys RegDefrag optimizes your registry by removing gaps, fragments and wasted space in Windows registry files. The program does not modify any registry entries. The defragmentation improves performance and boosts access to the registry.
* The Windows registry is the database of information that stores all of the setup, user preferences, software and hardware configuration information. It’s vital to the proper execution of Windows.
* Registry data is constantly being written to and removed during a normal Windows operation. Over time this data becomes fragmented. Quicksys RegDefrag optimizes your registry by removing gaps, fragments and wasted space in Windows registry files.
- Repairs defects by rebuilding your registry
- Remove fragmentation with a linear and sequential registry
- Compact registry by removing gaps, unused space and the amount of RAM the registry takes up
- Improves applications response time
- Makes Windows running more stable
- Protect privacy by erasing previously deleted registry cells.

My personal preference is this one