Free improve system performance software for windows

Comodo System Cleaner Portable 1.0 is an potent and high-speed tool which provides you a powerful solution to make your Windows XP or Vista computer faster, more efficient and more secure.
CSC allows users of all experience levels to thoroughly clean their systems of damaging and/or wasteful files, boost system performance and unlock the full power of any Windows XP or Vista computer.

CSC is a complete registry, disk and privacy cleaner
Comodo System Cleaner contains a fully featured Registry Cleaner that removes corrupt and obsolete registry entries - often the cause of system instability and slow down. The Disk Clean utility allows you to free up disk space and improve system performance by thoroughly removing temp, archive, duplicate and other useless files. Comodo Privacy Cleaner keeps your personal details safe and sound by comprehensively clearing all traces of private data from Internet browsers, Instant Messenger and Windows software.
What's more, CSC is the safest Registry and System cleaning utility available today. The unique 'Registry Protection' and 'Safe Delete' features will automatically recover any files deleted in error and restore your system to it's previous state should any problems occur.
CSC is also a Windows Tweaker
Through it's single interface, you can fine tune virtually every aspect of Windows behavior, functionality and performance. You get fingertip access to important controls and settings that are either not available or are very difficult to find in Windows XP or Vista - without the need to manually navigate through multiple Windows menus.
But that's not all!!
CSC also boasts numerous additional utilities to safeguard your privacy and security such as the hash value calculation tool. Innovative new utilities are constantly in development so this software will become even better over time.
Major Features:

1. Registry Cleaner - Optimizes and repairs your Windows registry by running an in-depth scan to identify, remove or repair any unnecessary or corrupted entries. After running a scan, Windows will be able to access the information it needs from the registry much more quickly - meaning your computer will get an immediate performance and stability boost. (click here to see how Comodo Registry Cleaner performed in a speed test against competing software)
2. Disk Cleaner - Over time your disk drives become cluttered with temporary Internet files, logs, needless archives, unused icons and duplicate files. This utility lets you quickly clear them all to free up space and improve performance. Also allows you to schedule regular clean up routines.
3. Privacy Cleaner - Obliterates your digital paper trail and helps protect you from identity theft by cleaning history, cache, cookies and usage records from Internet browsers, Windows locations and popular software.
4. System Settings - Unlock the full potential of your Vista or XP computer by quickly customizing otherwise obscure Windows settings with point and click ease. With over 50 tweaks in the 'System Settings' area alone, you can optimize Windows behavior in a more powerful and intuitive way than ever before.
5. System Information - Detailed and easily accessible 'dashboard' summary of all the hardware and software installed on your computer. Fast access to such details can be invaluable when you are considering hardware upgrades, the ability of your computer to run certain software and can assist you when judging whether to alter important system settings.
6. Autorun Manager - Fingertip control over exactly which programs and services start with Windows. Helps improve Windows boot up time, stops unwanted programs from hogging system resources and boosts overall system performance and stability.
7. File Checksum Calculator - Powerful and easy to use tool that calculates the hash value (checksum) of any file using a variety of well known algorithms. The ability to calculate the hash value of a file and compare it to the published value allows users to verify the file's integrity. If the two values match, the file is genuine and is not corrupted, unusable or a potential malware in disguise. Likewise, developers can also use this tool to calculate hashes for distribution with their software.