Picking out a PC registry cleaner for your PC can be a daunting task.
This is simply because there are too many software out there that are title to be the best in the market.
So to make this task a little simpler I will tell you what is essential to a registry cleaner to have, this will certainly help you on your hunt to find the best cleaner out there.
A good registry cleaner must meet the following criteria:

• Be up to date, regular updates on the software are really critical, this will ensure that your machine will be optimized for long time.
  This will also economize your hardware for future upgrades as it will last longer thanks to its updates.
  
• Be accurate to find registry errors (mismatch, corrupt, unlink and misplace keys).
  This is the main reason why you need a cleaner.
  To find and remove the very last clutter of unwanted registry files.
  This will increase drastically the speed and performance of your PC.
  
• (optional) Extra features, this is optional but very handy.
  This features are generally shortcuts for other optimization software such as disk defragmenter or scandisk, some even provide links to your anti-virus and firewall programs.
  

So as you see there are actually only couple of specs you have to worry about to find the perfect registry cleaner for your PC and they are updates and accuracy of the software.
Everything else is good and handy to have but to essential to optimize your pc speed performance.