Advanced SystemCare Free
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Full user review
"Good just got better!"
Firstly, it's free. Secondly it does what it promotes and protects/cleans one's system.
The Free version doesn't operate security and software scans automatically - i.e. If you want a scan, then you have to tell it.
I run Pro on two systems: a Toshiba laptop and an ASUS desktop. My ageing Compaq laptop runs the Free version, and it does a more that adequate job. I prefer to pay for Pro for the extra tweaks and the automatic 'set-and-forget' functions.