Are you looking for a free pc system cleaner for your slow running computer? If so check out CCleaner. CCleaner is a very strong industry leading cleaner for almost any pc. It is a very simple cleaner that goes into many areas of your registry and computer and cleans out old temporary files from third party applications.
CCleaner goes beyond the basic’s with extra mini-tools. A registry scanner removes old and unused entries, including ActiveX Controls, fonts, installers, shared DLLs, fonts, help files, application paths, icons, unused file extensions, and invalid shortcuts. CCleaner also includes an uninstaller and a list of deletable startup entry keys (the latter is something you'll want to evaluate carefully before removing a mystery key that turns out to be helpful.)