This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Error message DDL C:\Program files Mozilla Firefox\xul.dll Not valid, but lack of this file can't get on internet to download clean Mozilla.

  • 3 replies
  • 5 have this problem
  • 44 views
  • Last reply by cor-el

more options

The error message is as above DDL C:\Program files, etc. I can't get on the internet (because of t his error) to download a clean edition of Mozilla. Thank you for your help.

Allen

The error message is as above DDL C:\Program files, etc. I can't get on the internet (because of t his error) to download a clean edition of Mozilla. Thank you for your help. Allen

Chosen solution

You can delete the Firefox program folder to remove all Firefox files and install a freshly downloaded version to do a clean reinstall.

  • (32 bit Windows) "C:\Program Files\Mozilla Firefox\"
  • (64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"

Try this:

Read this answer in context 👍 0

All Replies (3)

more options

Your Windows computer has it's own web browser. Use it to do the download. If you can't, go to any computer, download the full installer to a thumb drive, then put it on your computer.

Download Firefox Full Installer For All languages And Systems {web link}

more options

Thanks so much for the suggestion, but I can't find Mozilla Firefox on my computer's Add/Remove page. Any suggestions? I got on the web with Windows Internet Explorer as you suggested, but if I can't remove Mozilla to install a new version, what to do?

Thanks you

more options

Chosen Solution

You can delete the Firefox program folder to remove all Firefox files and install a freshly downloaded version to do a clean reinstall.

  • (32 bit Windows) "C:\Program Files\Mozilla Firefox\"
  • (64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"

Try this: