FIX: CCleaner error when opening files for writing

Milan Stanojevic
by Milan Stanojevic
Deputy Editor
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  • CCleaner is a very popular utility software for Windows that removes unused files and invalid Windows Registry entries to keep your computer lean.
  • While installing, the Error opening file for writing might show. If this is the case, run CCleaner installer as Admin and check if it isn't running in the background.
  • Now that CCleaner is up and running, get the most out of it! Check out our CCleaner section on the site for related articles.
  • Users have a lot of different software installed. When an error occurs, we write a guide about how to fix it in our PC Software errors section on this website. Visit often.
ccleaner error opening file for writing

When you want to clean up or optimize your computer for better performance, there are many tools available that can help you do the job, and well at that.

One of these tools is CCleaner, arguably one of the world’s most popular ones that clear out temporary files cleans your Registry, and erases browser history among many other tasks.

CCleaner is also compatible with Windows operating system, and has a great user interface, support for Chrome and Internet Explorer, plus added support for programs like BitTorrent, AVG antivirus, Audacity and others.

In short, it is the ultimate tool for cleaning your system, but you still have to make a full system backup and create a new system restore point prior to using it.

Like any other software, CCleaner also has troubleshooting issues that bring up errors in its installation and usage, like the CCleaner error opening file for writing.

This error is associated with installation problems when using the tool if you’re trying to install it without being logged in as an administrator.

Check out the known solutions to resolve the CCleaner error opening file for writing.

How do I fix CCleaner error opening file for writing

  1. Retry running the installer
  2. Log in as an administrator
  3. Use CCleaner Portable

Solution 1: Retry running the installer

ccleaner error opening file for writing

If you run the installer, you may get a dialog box when a previous version of CCleaner is running. First, make sure to download the right installer from the official webpage. Then proceed with the process and in case the message shows again, wait for a few seconds and click Retry.

If this doesn’t get it back up and running again, try the next solution.

Solution 2: Log in as an administrator

As mentioned earlier, the CCleaner error opening file for writing may be caused when you try to run CCleaner without being logged in as an admin. In this case, you can log in as admin and run it, or contact your system admin for help with this.

If you were able to log in as administrator and this worked, you can carry on using CCleaner on your system, if not, try the next solution.

Solution 3: Use CCleaner Portable

CCleaner Portable is the perfect tool when you need to clean your system on the go or want to carry it elsewhere to do a cleanup on another computer system. This version lets you carry it in your USB flash drive and use it anywhere, though it may have limited functionality if you’re not using an administrator account.  Once installed, you can run CCleaner without logging in as an admin, but it may not clean certain files and folders.

Did this help resolve the CCleaner error opening file for writing? Share your comment in the section below.

FAQ: Learn more about CCleaner

  • What can I do if CCleaner won’t install?

Open Task Manager and search for the CCleaner process. End the process and then try installing the latest version grabbed from the official source.

  • Can I trust CCleaner?

Letting CCleaner perform and scan and then removing unused files, temporary files, leftovers and junk and cache for various other programs is very safe.

  • Should I use CCleaner with Windows 10?

Windows 10 also comes with a built-in Disk Cleanup tool which works ok. However, CCleaner can clean the computer deeper. It can also perform other tasks not included in the built-in tool.

Editor’s Note: This post was originally published in March 2018 and has been revamped and updated in April 2020 for freshness, accuracy, and comprehensiveness.

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