FCleaner Portable is a freeware all-in-one Windows disk and registry cleaning and optimization tool. It ... removes unused files and invalid registry entries that are eating up ... applications which run when Windows startup

Registry Life is a utility designed to improve system performance by fixing errors, defragmenting, and compressing the registry. Unlike similar freeware tools, Registry Life offers registry cleanup and optimization in a single tool. The registry cleanup tool scans the registry for a wide variety of problems and fixes them all at once. For example, it will remove invalid entries from the Windows startup registry and browser context menu;...