Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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.

Avatar for Username

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

This thread was archived. Please ask a new question if you need help.

Firefox loads, runs, but will not open web sites

  • 2 replies
  • 1 has this problem
  • 11 views
  • Last reply by FredMcD

dietersims
dietersims
more options

Firefox loads, runs, but will not open web sites. I have uninstalled and reinstalled several times.

At one point I got when during installation, I got error

"The code execution cannot proceed because VCRuntime140...1.dll was not found. Reinstalling the program may fix this problem."

I reinstalled runtime dll from microsoft web site.

Now after firefox installation, Firefox opens but simply will not download any web sites. All other browsers do with no problem. However, I prefer firefox and would like to get this problem fixed.

Firefox loads, runs, but will not open web sites. I have uninstalled and reinstalled several times. At one point I got when during installation, I got error "The code execution cannot proceed because VCRuntime140...1.dll was not found. Reinstalling the program may fix this problem." I reinstalled runtime dll from microsoft web site. Now after firefox installation, Firefox opens but simply will not download any web sites. All other browsers do with no problem. However, I prefer firefox and would like to get this problem fixed.
Attached screenshots

Chosen solution

VCRUNTIME140.dll = Microsoft Visual C++

Perform a System File Check to fix corrupted system files

Win 7, 8, 10, Vista: https://support.microsoft.com/en-us/kb/929833 Win XP: https://answers.microsoft.com/en-us/windows/forum/all/windows-xp-scan-and-fix-disk-errors/6fe2827a-4be6-4bc1-8083-5139b5aa3a3d

Wiki - Windows 10 System File Check http://answers.microsoft.com/en-us/windows/wiki/windows_10-update/system-file-check-sfc-scan-and-repair-system-files/bc609315-da1f-4775-812c-695b60477a93

Read this answer in context 👍 0

All Replies (2)

FredMcD
FredMcD
more options

Chosen Solution

VCRUNTIME140.dll = Microsoft Visual C++

Perform a System File Check to fix corrupted system files

Win 7, 8, 10, Vista: https://support.microsoft.com/en-us/kb/929833 Win XP: https://answers.microsoft.com/en-us/windows/forum/all/windows-xp-scan-and-fix-disk-errors/6fe2827a-4be6-4bc1-8083-5139b5aa3a3d

Wiki - Windows 10 System File Check http://answers.microsoft.com/en-us/windows/wiki/windows_10-update/system-file-check-sfc-scan-and-repair-system-files/bc609315-da1f-4775-812c-695b60477a93

FredMcD
FredMcD
more options

Some problems occur when your Internet security program was set to trust the previous version of Firefox, but no longer recognizes your updated version as trusted. Now how to fix the problem: To allow Firefox to connect to the Internet again;

  • Make sure your Internet security software is up-to-date (i.e. you are running the latest version).
  • Remove Firefox from your program's list of trusted or recognized programs. For detailed instructions, see

Configure firewalls so that Firefox can access the Internet. {web link}