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[avextraxjp]

Is there such a thing as defragmenting the registry?
What programs can I use for this purpose.
would it improve the efficiency of the computer?
Thanks
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[SoftStag]

The registry is quite simply data files that are stored on the hard drive. It is just a database of settings. These files cannot be defragmented within Windows itself as the files are constantly in use. Over time these files will become fragmented, and if you can defragment them, then potentially the OS may work slightly faster.

I don't think this is a major issue, unless a system has had quite a lot of software installed on it. However there is certainly not going to be a negative impact on doing so. You can try Free Registry Defrag which claims to defragment your registry.
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Quality Rare Domain Names

"Microsoft programs are generally bug-free. If you visit the Microsoft hotline, you'll literally have to wait weeks if not months until someone calls in with a bug in one of our programs. 99.99% of calls turn out to be user mistakes. I know not a single less irrelevant reason for an update than bugfixes. The reasons for updates are to present more new features."
-- Bill Gates, on code stability, from Focus Magazine

[avextraxjp]

Does CCleaner come with this feature?
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One problem leads to another

[SoftStag]

No, I don't think Ccleaner has this feature. It clears out unnecessary registry entries, but doesn't defragment the registry.
_________________
Quality Rare Domain Names

"Microsoft programs are generally bug-free. If you visit the Microsoft hotline, you'll literally have to wait weeks if not months until someone calls in with a bug in one of our programs. 99.99% of calls turn out to be user mistakes. I know not a single less irrelevant reason for an update than bugfixes. The reasons for updates are to present more new features."
-- Bill Gates, on code stability, from Focus Magazine

[avextraxjp]

There's an option to defrag PQ service in Vista Windows defragmenting
Is defragmenting PQ service the same as defragmenting the registry?
_________________
One problem leads to another

[SoftStag]

PQService is the name of a different partition on your hard drive that was put there by Acer. This is a hidden partition and should not be touched. It has nothing to do with your registry. Windows Vista does not have the facility to defragment the registry.
_________________
Quality Rare Domain Names

"Microsoft programs are generally bug-free. If you visit the Microsoft hotline, you'll literally have to wait weeks if not months until someone calls in with a bug in one of our programs. 99.99% of calls turn out to be user mistakes. I know not a single less irrelevant reason for an update than bugfixes. The reasons for updates are to present more new features."
-- Bill Gates, on code stability, from Focus Magazine

[Pink]

after CCleaner PC works evidently faster and no registry defrag is necessary, according to my practice. but, if needed, You can use two ways:
1. backup registry and restore ir again
2. to see for registry compact feature under windows itself