1)   Windows System Optimizer - Free Edition 2.0
Windows System Optimizer Free Edition is an optimizer software that speeds up your system, giving you maximum performance. It includes cleanup tools for Windows system.
License:Freeware, $ to buy Size: 1925KB

2)   Error Killer 2008.012
ErrorKiller is a Windows Registry Cleaner, Kernel32 DLL Error Message Fix and Access Violation Repair Software. Repair Errors related to missing startup and dll files, invalid device drivers, application paths, shortcuts and associations. - FREE SCAN
License:Shareware, $19.95 to buy Size: 2360KB

3)   Free Windows Registry Cleaner 1.0.0
Free Windows Registry Cleaner is a 100% free utility that removes registry errors from your computer. Registry errors occur for many reasons, including incorrect uninstallation, incorrect removal of software or corrupt hardware drivers.
License:Freeware, $0.00 to buy Size: 869KB

4)   Fix My Registry 2.4
The Windows Registry is a crucial part of your PC's operation system. Regular use of computer makes the registry fragmented and cluttered with obsolete and invalid data. Fix My Registry keeps this critical part of your PC in perfect condition!
License:Freeware, $0.00 to buy Size: 1040KB

5)   Free Window Registry Repair 1.0
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 to buy Size: 826KB

6)   Registry Trash Keys Finder 3.8.0
RTKF puts powerful registry cleaning tools into your hands. It quickly finds unwanted registry data. You may then safely strip out orphaned keys and other "rubbish" that's frequently left behind by "trial" software.
License:Freeware, $ to buy Size: 314KB

7)   Clean My Registry 4.4
The Windows Registry is a crucial part of your PC's operation system. Regular use of computer makes the registry fragmented and cluttered with obsolete and invalid data. Clean My Registry keeps this critical part of your PC in perfect condition!
License:Freeware, $0.00 to buy Size: 1997KB

8)   MISPBO Free Registry Cleaner 3.0
MISPBO Free Registry Cleaner is an advanced registry cleaning tool. The main function of is to allow the removal of unnecessary keys from the Windows Registry.It can also backup and defrag the registry.
License:Freeware, $ to buy Size: 1056KB

9)   Go Registry Mechanic 5.2
Safely clean, repair and optimize the Windows registry with a few simple mouse clicks! Problems with the Windows registry are a common cause of Windows crashes, slow performance and error messages. Make your system more stable.Improve the performance
License:Shareware, $29.95 to buy Size: 3351KB

10)   RegCure 2008.254
RegCure, the Advanced Registry Cleaner. Windows Errors Have Met Their Match! RegCure offers the most comprehensive feature set on the market. RegCure is the PC fix preferred by PC users. Scan your computer for errors, FREE! - FREE DOWNLOAD.
License:Shareware, $29.95 to buy Size: 966KB

1)   RegistryBooster 2
RegistryBooster 2, Uniblue's award-winning registry cleaner, is the easy answer to registry problems. It conducts deep scans of your registry to check for errors and conflicts, then repairs and optimizes the registry to peak performance and stability
License:Demo, $29.95 to buy Size: 4105KB

2)   Spyware Nuker Pro 2007.10

License:Shareware, $39.95 to buy Size: 3076KB

3)   Registry Trash Keys Finder 3.8.0
RTKF puts powerful registry cleaning tools into your hands. It quickly finds unwanted registry data. You may then safely strip out orphaned keys and other "rubbish" that's frequently left behind by "trial" software.
License:Freeware, $ to buy Size: 314KB

4)   ! ! RegCLEAN 2.262
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 to buy Size: 1608KB

5)   PC Bug Doctor 2008.251
BUG DOCTOR 2008 - FREE DOWNLOAD. BUG DOCTOR 2008 will fix hidden bugs and errors on your PC and increase the overall performance speed of your computer by as much as 300% BUG DOCTOR 2008 will fix all bugs and repair errors - FREE DOWNLOAD
License:Shareware, $19.95 to buy Size: 2676KB

6)   RegDoctor 1.94
RegDoctor can safely and quickly clean and repair Windows registry problems with a few simple mouse clicks! It uses an intelligent, high-performance detection engine to accurately identify missing and invalid references in your Windows registry.
License:Shareware, $29.95 to buy Size: 2180KB

7)   Bug Doctor 2007 Edition 2008.261
BUG DOCTOR 2008 - FREE DOWNLOAD. BUG DOCTOR 2008 will fix hidden bugs and errors on your PC and increase the overall performance speed of your computer by as much as 300% BUG DOCTOR 2008 will fix all bugs and repair errors - FREE DOWNLOAD
License:Shareware, $19.95 to buy Size: 2676KB

8)   Cure My Registry 1.0.1
Cure My Registry helps make your slow PC a thing of the past. With a few mouse clicks, you can fix illegal entries in your Windows Registry and have the High Performance PC that you deserve. Cure My Registry is compatible with all Windows Version.
License:Freeware, $0 to buy Size: 722KB

9)   CleanMyPC Registry Cleaner 3.51
CleanMyPC Registry Cleaner scans the Windows registry and finds incorrect or obsolete information in it. By fixing obsolete information, your system will run faster and error free. Also features registry backup/restore, startup and BHO organizer.
License:Shareware, $29.95 to buy Size: 2711KB

10)   Registry Fix (Windows Fixer) 2007.10
Registry Fix will scan your system registry and hard drive for invalid file and system references. These invalid references may cause system instability, PC errors, constant crashes, and general system slowdowns.
License:Shareware, $37 to buy Size: 3076KB