Registry is one of the important parts of a computer system, because the registry stores important data from existing software and hardware on the computer. Every time we install new software then the software information is stored in the registry, so also when we do I uninstall the items in the registry will also be deleted, though sometimes not perfect or there are some settings that are stored in the registry.
To solve the problem on registry and improve performance, we can use a registry cleaner. Registry cleaner, is used to fix the registry or remove items in registry that is no longer needed, usually the items left behind during uninstall process.