Advanced SystemCare 13 is the latest edition of IObit's amazingly comprehensive PC maintenance suite.
Just installing the package gets you an entire library of essential tools. There are modules to clean and optimise your Registry, delete junk and duplicate files, control your startup programs, fix Windows issues, detect and remove malware, free up RAM, update and back up your drivers, undelete files, fully uninstall applications, schedule PCs shutdowns, securely wipe confidential files and apply a host of useful Windows tweaks. (And you could build another excellent maintenance suite from the modules we've left out.)
There's real depth and intelligence here, too. SystemCare doesn't just list your browser toolbars and startup programs and leave you to figure out what to do next, for instance - it highlights unnecessary or dangerous items and allows you to remove them with a click.
If you want even more functionality, the PRO version includes an Internet Booster module, Auto RAM cleaning tool, a disk optimisation feature, tools to improve system startup and much more.
Advanced SystemCare's tools are of variable quality, but there's still a vast amount of functionality here.