Microsoft RegClean 4.1a

RegClean is a fairly small application that will save a lot of start-up time. It clears the Windows 95 Registry safely and effectively. With the Registry cleaned out, you'll have a shorter wait whenever you boot the system.
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Requirements: Windows 95/98/NT
Limitations: No limitations
Publisher: http://www.microsoft.com/

Auslogics Disk Defrag 1.4.16.308

Disk fragmentation leads to system slowdowns, PC crashes, slow startup and shutdown and sometimes to system failures. Auslogics Disk Defrag is designed for fast optimization of today's modern hard disks. Get the maximum performance out of your expensive hardware investments.

Version 1.4.16.308 may include unspecified updates, enhancements, or bug fixes.

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Requirements: Windows NT/2000/XP/2003 Server/Vista
Limitations: No limitations
Publisher: http://www.auslogics.com/

TweakNow RegCleaner Standard 3.0.1

The Registry is the heart and soul of any Windows system. It contains information that controls how your system appears and how it behaves. When you install an application, new Registry entries will be created. These entries automatically will be deleted when you uninstall the application. Unfortunately, this process does not always work. Sometimes, some applications fail to remove their own Registry entries. These entries become obsolete. After a long period, after you install and uninstall a number of applications, your Windows Registry will contain a large number of obsolete entries. This will significantly increase the Registry size and slow down your computer, because Windows will need more time to load, search, and read data from the Registry. To keep your computer at top performance, it is recommended you periodically clean your Windows Registry.

Version 3.0.1 may include unspecified updates, enhancements, and bug fixes.

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Requirements: Windows 2000/XP/2003 Server/Vista
Limitations: No limitations
Publisher: http://www.tweaknow.com/

Glary Utilities 2.5.3

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.

Version 2.5.3 improves registry cleaner, startup manager, Web update, and fixes some bugs.

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Requirements: Windows 98/Me/NT/2000/XP/2003 Server/Vista
Limitations: No limitations
Publisher: http://www.glaryutilities.com

Belarc Advisor 7.2.24.5

Belarc Advisor builds a detailed profile of your installed software and hardware, including Microsoft Hotfixes and software serial numbers, and shows the results in your Web browser. All of your PC profile information is kept private on your PC and is not sent to any Web server.

Version 7.2.24.5 may include unspecified updates, enhancements, or bug fixes.

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Requirements: Windows 95/98/Me/NT/2000/XP/2003 Server/Vista
Limitations: No limitations
Publisher: http://www.belarc.com/

SpeedFan 4.34

SpeedFan monitors voltages, fan speeds, and temperatures in computers with hardware monitor chips. It can even access SMART information for hard disks that support this feature, and show hard-disk temperatures if that's supported. SpeedFan fully supports SCSI disks and can even change the FSB on some hardware (but this should be considered a bonus feature). At the lowest level, SpeedFan is a hardware monitor software that can access temperature sensors, but mainly it can control fan speeds (depending on the capabilities of your sensor chip and your hardware) according to the temperatures inside your PC, thus reducing noise and power consumption.

Version 4.34 may include unspecified updates, enhancements, or bug fixes.

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Requirements: Windows 95/98/Me/NT/2000/XP/2003 Server/Vista
Limitations: No limitations
Publisher: http://www.almico.com

Abexo Free Registry Cleaner 1.1

Abexo Free Registry Cleaner is the freeware edition of Abexo Registry Cleaner. This software aims at making your computer run faster by cleaning Windows system registry. One-click registry backup, cleanup and defrag (shareware version only). Version 1.1 includes bug fixes and improvements.
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Requirements:Windows 98/Me/2000/XP
Limitations: No limitations
Publisher: http://www.abexo.com/