There are many registry tools out on the Internet which proclaim to be the "best", but in order to get the most out of these tools, it's essential that you're able to identify & use the best one.
Because registry cleaners are all designed to do a similar job, we are fortunate in that there are certain features you can look for in these tools to identify the best one, and the two mentioned below are the ones which can determine whether the cleaner is the best or not.
Here's what you need to look out for:

1. Ability To Find The Most Errors - Registry repair programs are all designed to scan through Windows and fix errors that appear inside the "registry" database of your system.
   The registry database is a huge part of your PC which stores everything from your desktop icons to your stored login details and is what Windows relies on to help it recall all the different files & settings that your PC needs to run.
   The reason why registry cleaners are so effective & popular is because of the way the registry database often becomes damaged and corrupted, leaving the various files that your PC needs unreadable.
   To fix this, you need to be able to use a registry cleaner tool that's going to be able to fix the most errors on the Windows system in the most reliable way.
   The trick to find the tool that does this is to look at the number of categories it scans.
   The best registry cleaners all scan through the most categories, allowing them to fix the most errors.
   
2. Safe To Use (Backup Facility) - On top of being able to fix the most errors on your system, you also need a tool that's going to keep your computer as safe and reliable as possible, with a backup facility.
   All the top registry cleaners have backup facilities, which makes it essential that you don't use any registry cleaner that doesn't have this feature.
   

Finding the best registry repair program is all about looking at the tools available and then identifying the ones which have the best attributes & features.
There are many registry programs that claim to be the "best", but the fact is that only a handful of the tools out there will fix your PC in the most reliable & effective way.
You should look at recommendations online and then identify the cleaner that's going to help your PC in the best way possible.
We've used a lot of registry tools and have found that one called "Frontline Registry Cleaner" is the most effective for any Windows system.
This has a backup facility, as well as a powerful registry scanning engine, both of which allow your computer to run extremely quickly and reliably.
This tool is quickly becoming extremely popular, thanks to the way it's able to fix the most errors on a PC.
It also has a junk file remover which people seem to love as well.