4Diskclean Software performs a complete cleanup of your system and blocks spyware. It deletes all unneeded files, including temporary data, old backups, duplicated files and DLLs, files viewed in your Web browser and stored in the browser cache, the history of URLs visited, and cookies. Free up disk space, fix and prevent errors on your system, and speed up your system with 4Diskclean Software. The product's features include the ability to clean temporary and obsolete files, to block spyware, adware, and bad cookie installation (1,751 items), to clean temporary files and folders in more than 160 popular software programs and to clean registry entries that store computer usage in Windows and popular software programs. The application also has the ability to autoclean the Internet Explorer cache on browser exit, to clean the Internet browser cache, cookies, and URL history, to eliminate duplicate DLLs and files, to clean Windows temporary folders, and to fix broken Start menu and desktop shortcuts. Version 4.5a blocks spyware and adware installation.