Advanced SystemCare Free

Obit's Advanced SystemCare Free 4 offers a moderately useful set of free tuneup tools that performs tasks from cleaning your disk of unnecessary files to protecting your privacy by erasing traces of your surfing habits, defragging your hard disk, scanning your system for security holes and more. 

I have been using this successfully for quite a while. I liked it enough to upgrade to the paid version. It is very user friendly