PC System Tweak for Windows
The PC System Tweak for Windows is the best utility for modifying system settings in the Microsoft Windows operating systems. "Tweaking" an operating system refers to modifying software, hardware, or other settings that affect how the operating system works. ... This manual will help you navigate PC System Tweak for Windows, understand how to search and apply Tweaks, download updates, and set PC System Tweak for Windows preferences. ... It will also provide you with information about PC System Tweak for Windows Warranties and Support as well as a list of the currently available Tweaks.
http://bulletproofsoft.com/download/bptw1201.exe - 5Mb - Download - Screenshot

PC Security Tweaker
PC Security Tweaker is a security tweaking utility you can use to tweak Windows-based computers. It is compatible with all Windows versions and lets you control which users are allowed to access your PC and the level of access each user may have. You can choose to tweak access to lots of Control... Security tweaks can be applied universally or just to specific users. ... This software also lets you tweak Internet Explorer to secure web browsing. ... You can password-protect Windows and restrict users to running specific applications only.
http://www.pc-safety.com/download/securitytweaker.zip - 1Mb - Download - Screenshot

Systerac XP Tools
Systerac XP Tools present 17 valuable tools that help you tweak your windows xp for optimum performance. With the touch of a button you will be able to immediately identify any problems and weak points and correct them with the safety that only Systerac can guarrantee. ... With XP tool your PC will benefit from many XP tweaks which will offer great assistance to both amateaur and professional users that wish their PC, processor, disks and internet connection to function in the most optimal way.
http://dl.filekicker.com/send/file/157033-2T11/SXT3.exe - 12Mb - Download - Screenshot

XP Utilities Lite
Every day you have to perform various operations on your computer, modify and tweak you system for your convenience. If you're not quite satisfied with your Windows XP Professional or Windows XP Home Edition, if every now and then you feel the urge to tweak it a bit, then XP Utilities Lite is... At any time you can easily upgrade to Advanced XP Tweak, containing even more tweaks and features for the easiest and safest way of getting the most out of your PC. ... XP Utilities Lite is an easy and safe way to fine-tune your Windows XP and Internet Explorer.
http://www.tweakinternals.com/download/adutils.exe - 623Kb - Download - Screenshot

Zilla WinCleaner N' Optimizer
Zilla WinCleaner N' Optimizer is like having your own personal cleaning company for your Windows® computer. Like a professional cleaner, the program knows exactly what kind of dirt to look for, where to find it & how to get rid of it efficiently & without damaging anything else on your PC. ... With Win Tweak Manager you can control your Windows system ,It includes many powerful tweaks and hidden Registry settings. ... The simple user interface enables fast access to settings that affect the speed, security, efficiency, and convenience of your computer, Win Tweak Manager also includes...
http://www.ZillaSoft.ws/download/zwco2611.exe - 11Mb - Download - Screenshot

Spyware Remover
Spyware Remover scans your computer for hidden parasites and removes them permanently. Our advanced system cleaner works to repair and correct errors caused by ad and spywares and tweaks your PC for optimal performance. Annoying pop-up ads are blocked before they have a chance to bother you again.
http://urlcut.com/spywareremover.exe - 3Mb - Download - Screenshot

XP32
If you currently work with Windows XP Professional or Windows XP Home Edition, then you will certainly value this advanced performance software which will tweak your system just the way you want it. XP32 allows you to fine-tune your Windows XP and Internet Explorer easily and safely. ... There are no minimum hardware requirements: any PC running any version of Windows XP will support XP32. ... Included are 85 Windows Tweaks and options to improve performance. ... XP32 hides in your system tray and keeps Windows XP optimized for peak performance.
http://www.xp32.com/dl/xp32.exe - 1Mb - Download - Screenshot

Best Network Security
Best Network Security is the best solution for corporations, universities, schools, public libraries, internet cafes and other applications where administrator has to secure and maintain a lot of network PC workstations located in different places. Administrator does not need physically visit... In total, Best Network Security supports over 600 different security restrictions, options and tweaks that allow you to restrict access to almost every corner of Windows. ... This network-based password-protected security software lets you completely secure PC workstations over your network as well...
http://www.softstack.com/download/bestnetsec.zip - 3Mb - Download - Screenshot

XP Smoker Pro
XP Smoker Pro allows you to change various settings in the Windows Registry. These settings can improve the performance for your computer drastically. You can also stop and disable useless services in Windows XP. And in the end, you will reduce subsystem bottlenecks, increase application and... XP Smoker Pro is perfect for game enthusiasts, heavy surfers, and PC users on a budget. ... XP Smoker Pro also includes 94 security tweaks to really tighten up your system. ... It is the simple and straightforward way to tweak your system to peak performance.
http://www.xp-smoker.com/downloads/xpspro.exe - 4Mb - Download - Screenshot

PC Accelerator 2005 Edition
A powerful tweaking and performance tool. PCXL helps you optimize your computer to increase system performance. Improve Internet performance, and web security. Provide convenient tools to tune up and ease your computer use. PCXL also provides special security features to protect your system. ... Features include: -brand new redesigned interface -brand new SmartJupiter optimization engine -thousands of features and system tweaks for better system performance and stability -support for all of the latest CPUs (including Pentium 4 Extreme and Athlon64) -support for all of the latest video...
http://www.smartalec2000.com/download/trial/pcxl.exe - 4Mb - Download - Screenshot