ccleaner.exe is a File Cleanup Module
from Piriform Ltd
belonging to CCleaner
. This is a freeware system optimization and privacy tool.
Non-system processes like ccleaner.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues.