Pros   As a freeware enthusiast, I try to find the freeware can improve work efficiency, this CCleaner is a good one of them, when we have a new computer, it usually running very fast, but some time later, the computer will always be getting slower and slower, it is because the operation of various programs will always produce junk files, especially surfing the Internet, so that some people want to upgrade the computer or buy a new one. But in most cases, you just need to use the computer system cleaning software, such as this CCleaner, it can Clean up the computer system to resume running speed. In addition to cleaning up junk files to speed up the system speed, this software can also protect your privacy, it can clear all your internet explorer history, and the files opening history, just need one click, you can clear all these records, so none know which website you had visited and which files you had reading.