Using CCleaner for System Maintenance

This document describes how to use CCleaner for Windows system maintenance. CCleaner is a free product that removes temporary files and invalid registry entries.

Important: CCleaner does NOT remove viruses or malware. If you think your machine is infected, Get Help from DoIT.

Note: CCleaner is not supported by the DoIT Help Desk. We can provide best effort support only. If you encounter trouble using CCleaner, you should contact Piriform for support by going to

CAUTION: This document includes instructions for modifying the registry on your computer. Modifying the registry improperly can result in Windows becoming corrupted. You should only attempt these directions if you have your data backed up and are willing to risk creating additional problems. You should also back up the Windows registry (see Windows - Backing up the Registry) before attempting any changes. The DoIT Help Desk is not liable if you choose to attempt the fix described below.

Removing unwanted and temporary files

  1. Download CCleaner from the manufacturer's website.
  2. Run the installer and follow the prompts. CCleaner will automatically launch after you click Finish.
  3. From the main screen, click analyze to search for potentially unwanted files. Click Run Cleaner to remove these files.

Fixing registry issues

  1. Click the Registry tab on the right side.
  2. Click Scan for Issues.
  3. Click Fix selected issues.

Other tools