Registry Fixers

Registry fixers software can improve your pc in many ways like:

Delete correctly installed software: sometimes you try to delete something, and i s not possible, because the software that you just installed let information in the registry, so if you don't clean that registry, your pc still believe that has that software.
Let residual registry entry could slow your pc, can give weird behaviors to your pc.
So always is convenient at least one a month run registry cleaners software to keep the integrity of your system.