Wise Registry Cleaner is a free application that will help you optimize the performance of your computer and repair any errors in your Windows registry.
The software will analyze your registry to find any invalid components, file associations for programs that no longer exist, any unassociated DLLs, and any other errors that may be present. Then by clicking repair, it will automatically start to repair all the items that have been selected.
Also included are two other options: the system boot optimization tool will analyze your start up programmes to improve the boot speed, and the registry defragmenter that will free up some space on your hard drive.
This is a very efficient tool to get that little bit extra out of your computer and clean up the trash that invariably accumulates in the registry over time. It hardly takes up any space, and is also portable.