Advance System Care is an all-in-one utility for your computer maintenance. It can repair, protect and optimize your system. It has anti-spyware, registry fixer, defragger, and optimizer. The optimizer enables you to adjust/tweak your system according to your system capability. The best part of this optimization is it is done automatically by Advance System Care.
ADvance System Care is free for basic users and the Pro version has some few upgrades like system boost.
Official website: http://www.iobit.com/advancedsystemcareper.html