Registry is heart for your computer and you should be very care full regarding it and you should always optimize it to work fast and fine and safe so you need to update these to optimize to remove unwanted gaps ,waste space in windows..
since they are not in easy language and hard for us to understand so for optimize it there is a software called QuickSys RegDefrag.
It is a free utility app which will optimize and clear all your problems of your windows..
Here are the Features that you might like to k now :-

* It Repairs all the defects by rebuilding your registry
* It also remove fragmentation with a linear and sequential registry
* Compact registry by removing gaps, unused space and the amount of RAM the registry takes up
* it also Improves applications response time for quick response
* Makes Windows to run in stable way * It also Protect and has privacy by erasing previously deleted registry cells.

Download Quicksys RegDefrag here