How can you know whether or not the OP's registry needs cleaning?
The registry never needs cleaning. It's very small and doesn't take up much space on the system. And changes to registry entries should be limited to the programs that created those entries in the first place, otherwise bad things can happen. So using a "registry cleaner" is far more dangerous than just leaving the registry alone.
These days, I find that standalone software often works better if it doesn't use the registry at all. Putting the software in its own folder with its own configuration or .INI file can work very well, despite the alleged obsolescence of the technique.