A top registry cleaner software can remove invalid entries. Some applications will only clean out the ‘empty’ registry entries. Most of registry errors, pop-up messages, and overall computer instability is caused by invalid entries. A registry entry basically contains the location of some important files that are on your computer. These files are used by certain applications in order to function. You can speed up PC effectively. A problem would be occurred and the cleanings done by registry cleaner will no longer have a positive effect on PC’s performance if the registry cleaner only removes the empty files but leaves all of the invalid entries.