The Windows Registry is a hierarchical database that stores configuration settings and options on Microsoft Windows operating systems. It contains settings for much of the information and settings for software programs, hardware devices, user preferences, operating system configurations, and much more
It is the master control center for your PC’s operating system and all its applications. Many performance problems are caused by corruption within the Registry resulting in these sorts of problems – slow Windows start-up and shutdown, poor application startup times, just to name a few.
Cleaning, compacting, and optimizing your Windows registry can go a long way to improving your computer’s performance.
While it is inadvisable to go poking into the Registry unaided and there are a number of good applications that can do this for you, the simplest one I’ve found is a tool called Registry, part of Piriforms’ CCleaner.
Cleaning the Registry
Open CCleaner and then select the Registry button from the vertical toolbar.
The Registry Cleaner screen opens. You will see a series of checked boxes on the right of the toolbar. All of these are areas need checking.
Press the Scan for Issues button.
Opening screen for Registry
When the scan is over, all the issues are shown in the right-hand window.
Registry scanned displaying Issues
To fix them, press the Fix selected issues button.
Registry asks an important question!
Before any issues are fixed Registry asks you if you want to make a backup file.
When dealing with the Registry it is a good idea to make a Backup file.
To do this click the Yes button.
Creating a Registry Backup file
Next, My Documents folder opens displaying the backup file. Click the Save button.
Once you save the Backup files, Registry displays its Fix It dialog box. You then have the choice of fixing each individual flagged problem (tedious) or biting the bullet and selecting Fix All Selected Issues. This is your best choice.
Registry’s Fix It dialog box
A new dialog box opens showing Registry has completed the job. Click the Close button to shut down Registry.
Registry finishes the task
The final window states there are no issues now in your Registry. You can now close CCleaner.
No issues left in your Registry
You have successfully cleaner “junk” out of your computer’s Registry.
Sourcce:http://www.windows7news.com/2011/08/26/attending-computers-registry/

