1)   Registry Defragmentation 8.9.7.16
Registry Defragmentation is a small utility that does gigantic improvements in computer performance. This application physically defragments the Windows registry file to give it the proper linear structure.
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 2)   Registrar Registry Manager 5.55
Registrar Registry Manager is a complete registry management solution with a wealth of powerful features. It is intended as a complete and safe solution for administrators and power users for maintaining the Windows registry.
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 3)   Advanced Registry Doctor Pro 8.8.8.21
Advanced Registry Doctor (ARD) will cure your registry and thus provide a better performance of your Windows OS.
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 4)   1st Registry Repair 1.6
1st Registry Repair is a utility to optimize your system registry by finding and removing errors and invalid entries.It provides a backup option that lets you restore the registry in case you run into problems.
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