What's a good registry fix software?

Know of ones that really work instead of actually being spyware themselves? Are there any that fix registries for free?

What's a good registry fix software?spyware remover

Delete the wrong key and Windows will not start.

Registry Cleaners

http://mywebpages.comcast.net/SupportCD/...

Myth - "Registry Cleaners improve performance."

Reality - "A few hundred kilobytes of unused keys and values causes no noticeable performance impact on system operation. Even if the registry was massively bloated there would be little impact on the performance of anything other than exhaustive searches."

Notes - "Registry Cleaners can fix problems associated with traces of applications left behind due to incomplete uninstalls. So it seems that Registry junk is a Windows fact of life and that Registry cleaners will continue to have a place in the anal-sysadmin's tool chest."

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Free Registry Cleaners

Windows Live OneCare

http://onecare.live.com/site/en-us/defau...

Full scan: Backs up registry and then cleans registry, virus and spyware scan, disk cleanup, disk fragmentation (if needed), updates windows, and checks for open firewall ports.

Clean up scan: Backs up registry and then cleans registry, updates windows.