CCleaner combines both the tools designed to getting rid of junk files, broken registry entries, temporary files and cache, and instruments assigned to protect your system from malfunctions by managing restore points, finding duplicates and keeping your startup list in good and healthy shape. Luckily, periodic system scans and cleanings may fix the situation, and CCleaner will be quite helpful here. In such a case, even reliable antivirus won’t bring any help. After some period of time even new brand OS can include malicious software, whereas the leftovers after removing the apps can harm your PC and have impact on the overall system performance.