WinASO Registry Optimizer scans the Windows registry and finds incorrect or obsolete information in the registry. 
By fixing these obsolete information in Windows registry, your system will run faster and error free.

Your Windows registry keeps growing every second when you use your computer! It continuously records all the information and changes of software, 
hardware and system settings. Over time, your registry will be accumulated with a large number of obsolete, 
redundant and invalid entries and registry holes, which seriously affect your PC performance.

But editing and cleaning registry items is not only a time-consuming job, but a highly risky one. 
Improperly modifying registry items may affect your system running or even cause severe system damages. 

WinASO Registry Optimizer will clean and fix most registry errors including:

    Invalid User software settings
    Invalid system software settings
    Invalid browser helper objects
    Invalid custom control settings
    Errors in uninstall sections
    Shared DLL errors
    Sound and AppEvents errors
    Startup popup window
    Invalid System settings
    Invalid help and resources
    Empty registry keys
    Invalid fonts
    Invalid class keys
    Invalid start-up programs
    ActiveX errors
    Obsolete history lists
    Invalid file paths
    Invalid file extensions
    Invalid software locations
    Windows services error
    Invalid virtual devices
    Invalid device drivers

more info 
http://www.winaso.com/