When it comes to picking a registry cleaner you really need to do your home work.
There are hundreds of these cleaning tools out there but getting a good one can be rather a challenge.
Most people who are looking for a registry cleaning tool are doing so because they want to speed up there computer.
If that sounds like you then what you are really looking for is a PC optimization tool.
You need a program that will not only remove those invalid registry entries but also allow you to manager your startup programs, remove junk temp files and delete invalid shortcuts.
Many registry programs out there do not have all these tools in one.
You need to do your own research and test out a few different cleaners before until you find one that meets all your needs.
The good news here is all the top registry cleaning programs out there are going to have free limited trials for just this purpose.
I should also note that many of these programs while limited do allow you to use several of the features with out registering the program.
You should try out all the main features and see if you like the user interface and that it covers all of the above that I listed.
The bad thing about the reviews out there is most people are simply trying to push the product that gives them the highest commission profit and they call it the best registry cleaner.
You need to take all of these reviews with a grain of salt and fully demo out the software for yourself.
On a final note you always need to make a backup of the registry before you remove any entries.
Any decent program out there will prompt the user to do so before the repair is done but check for a backup feature before you even scan just to be safe