If you're unfamiliar with the Windows registry, it's not advisable that you use a registry cleaner. The risks are just too high, as compared to the possible gains.
The registry is what keeps your computer running; it tells the computer what to do when certain events happen. However, as you use your computer, a lot of unwanted and unnecessary information is written into the registry, and this usually occurs because you've installed and uninstalled programs or updated versions of existing programs. This gradual accumulation of unneeded or incorrect information will, over time, slow the speed of your computer.
A registry cleaner tries to get rid of this unwanted data and restore your PC to full speed. The problem is that the cleaning process is less than perfect. In particular, there is always a small risk that the registry cleaner may incorrectly remove data that is actually needed. In the worst case scenario, your PC may become unusable as a result.
That's why it's absolutely essential that you backup your registry before using a registry cleaner. For most users the easiest way to do this is to create a system checkpoint. An even better way is to use a drive-imaging program to create a snapshot of Windows, which you can use for system recovery if needed.
This ever-present risk of problems is why the "best" registry cleaner is the one that causes the fewest problems, rather than the one that finds the greatest number of registry errors.
EasyCleaner is our top recommendation. Historically, it has proven that it doesn't create problems, and it periodically updates its list of "registry values" that must not be cleaned under any circumstance. It also detects and deletes duplicate files and cleans up all your temporary files to provide more usable disk space, but this should be viewed as a bonus rather the primary function of the product.
Eusing Free Registry Cleaner is another option, but it lacks many of EasyCleaner's features. Despite this fact, it has a reasonably good track record.
Another option is a program called RegSeeker, but we've determined that it has caused numerous problems, so we're reluctant to recommend it.
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