1)   SpeedItUp Extreme - Free Speed Booster 4.00
Speed It Up EXtreme is an all in one Speed Booster designed to significantly increase the speed of your computer and boost your PC available memory. Making your computer run much faster. Some users reported up to 300% (3 Times) Faster.
License:Freeware, 0 USD to buy Size:1.7 MB

 2)   PC Booster - Max Memory 5.10.023
PC Booster - Optimize, Accelerate and Stabilize your Computer PC Booster safely optimizes your PC automatically: Tweak hidden System, Internet, Memory, Hard Disk, CD-ROM/DVD-ROM, Desktop, and Start-up/Shut-down settings for maximum performance.
License:Shareware, 29.95 USD to buy Size:4 MB

 3)   WinXP Manager 5.2.6
All-in-One utility to optimize, tweak, clean up Windows XP. It bundles more than 30 different utilities in one! Get access to hundreds of hidden options, clean registry and junk files, speed network, uninstall smartly and many other utilities.
License:Shareware, 39.95 USD to buy Size:5.30 MB

 4)   Vista Manager 1.4.2
All-in-One utility to optimize, tweak, clean up Windows Vista. It bundles more than 30 different utilities in one! Get access to hundreds of hidden options, clean registry and junk files, tune up Vista boot menu and many other utilities.
License:Shareware, 39.95 USD to buy Size:5.44 MB

 5)   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.
License:Freeware, 0.00 USD to buy Size:0.70 MB

 6)   BySoft FreeRAM 4.0.5.025
BySoft FreeRAM 4.0 is 32-bit win95/98/NT/2000/XP freeware program that defragments and reclaims memory from the operating system and applications. This decreases load time and boosts application performance.
License:Freeware, 0 USD to buy Size:0.48 MB

 7)   WinCleaner Memory Optimizer 5.0
Cleans, optimizes and frees your computer's memory. Memory is vital to the performance of your computer and that is why this software can help boost your system's performance. WinCleaner Memory Optimizer is set-and-forget software.
License:Freeware, 0.00 USD to buy Size:0.79 MB

 8)   RegCleaner 2007
RegClean - Fix your PC Errors! RegCLEAN will scan your registry, finding all of the errors causing your PC problems, and will then repair those errors instantaneously. - FREE DOWNLOAD
License:Shareware, 19.95 USD to buy Size:1.57 MB

 9)   4Diskclean Freeware 4.0
Windows and other application creates temporary files *.TMP and *.~* that aren't deleted if an error occurs. With time your hard disks have hundreds of this temporary files that only take disk space. Delete all with a button click. 8 idioms.
License:Freeware, 0.00 USD to buy Size:0.59 MB

 10)   VAS Free System Tools 1.0
VAS Free System Tools is a collection of tools to clean, maintain, and optimize your Windows. It includes : Disk Cleaner, Startup Manager, Uninstall Manager, Registry Editor, Memory Optimizer.
License:Freeware, 0 USD to buy Size: MB

 11)   SpeedItUp Extreme - Free Speed Booster 4.00
Speed It Up EXtreme is an all in one Speed Booster designed to significantly increase the speed of your computer and boost your PC available memory. Making your computer run much faster. Some users reported up to 300% (3 Times) Faster.
License:Freeware, 0 USD to buy Size:1.7 MB

 12)   TweakRAM 6.2.10.21
TweakRAM is designed to clean your PC memory. It can Optimize RAM to make your computer run faster and crash less often. and Increase your system performance by cleaning the content of your RAM(Memory).
License:Shareware, 19.95 USD to buy Size:2.34 MB

 13)   Xp Repair Pro 2006.3.1.6
XP Repair Pro 2006 Scans and Repairs over 53,000 Windows Errors. It will fix random PC crashes, error messages and improve system performance by up to 750 percent. Our unique and one of a kind technology is guaranteed to fix problems on your system.
License:Shareware, 36.95 USD to buy Size:25.41 MB

 14)   Free Memory Optimizer 2007
MemAgent Memory Optimizer is a well-recognized computer memory management software that increases your computer speed, prevents system crashes and stops memory leaks. Significant performance boost for less money it takes to upgrade your RAM.
License:Shareware, 24.95 USD to buy Size: MB

 15)   vOptimizer FreeWare 4.0.43.0
vOptimizer is an advanced optimization solution that quickly and easily reduces a Microsoft or VMware virtual machine's virtual hard drive to the smallest possible size while optimizing the Windows guest operating system for speed and performance.
License:Freeware, 0 USD to buy Size:5.46 MB

 16)   PC Error Eliminator 3.00
PC Error Eliminator search your harddrive fixing various types of errors to supercharge your PC's performance and stability. It fixes PC problems that cause errors, crashing, slowness, instability and prevents them from happening again.
License:Shareware, 29.95 USD to buy Size:0.66 MB

 17)   Startup Optimizer 1.6
Awarded freeware that inspects startup programs and provides useful information for harmful programs like spyware, virus and diallers. It makes your system healthier and maintain a higher degree of privacy.
License:Freeware, USD to buy Size: MB

 18)   Free Window Registry Repair 1.5
Free Window Registry Repair is a freeware to safely search inside your entire Windows registry for any invalid entries and repair them. It can automatically backup any repairs made to restore the Registry back to the previous registry state.
License:Freeware, 0 USD to buy Size:0.75 MB

 19)   A1Click Ultra PC Cleaner 1.01.61
Use Clean PC, Remove Tracks, or Do-it-yourself Setup to find internal clutter, hidden stores, junk files, and registry trash - 7 Bonus Cleaning Tools - uses A1Click Technology and No Remains Deletion - can run automatically at startup, keeps undo.
License:Shareware, 29.95 USD to buy Size:1.15 MB

 20)   Ashampoo Magical Optimizer 1.20
Clean the whole system: release the brake of your computer with only one mouse click!
License:Shareware, 12.99 USD to buy Size:4.70 MB