Firefox installations on Windows have been simplified with the online Firefox Installer. This streamlined installer removed the Options page which allowed you to change settings such as the installation folder and whether to add program shortcuts. How to download and install Firefox on Windows explains how to install Firefox with standard options using the online Firefox Installer.
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This article explains how to customize your installation with the full, offline Firefox Setup file and the options that are available.
Table of Contents
2How to install Firefox with custom settings
You can download the Firefox Setup file in your language, from this Firefox download page.
Note: You can install the 32-bit version of Firefox on 64-bit Windows but 64-bit Firefox is recommended (see this blog post for details). On 32-bit Windows systems, only the 32-bit version of Firefox can be installed.
When you run the Firefox Setup file, the Mozilla Firefox Setup Wizard will open.
After clicking you can choose a Standard or Custom installation. The Standard setup will be selected by default.
A Custom setup lets you choose the folder where Firefox program files will be installed, as well as which shortcuts to create. These options are not available in a Standard setup. Select the Custom setup type and click .
Choose where Firefox is installed
The next step is where you can choose a different Destination Folder, which is where the Firefox program will be installed.
C:Program FilesMozilla Firefox is the default folder path on 32-bit Windows. It's also the default location on 64-bit Windows when the 64-bit Firefox version is installed.
When the 32-bit Firefox version is installed on 64-bit Windows, the default folder path is C:Program Files (x86)Mozilla Firefox
You can change the folder where Firefox will be installed either by manually typing the location of another folder on your computer or you can click to select a new folder.
Space required: The amount of space on your hard drive that's needed to install Firefox.
Space available: The amount of space available on your hard drive.
In the next screen you can choose whether to install the optional Mozilla Maintenance Service which allows application updates to occur in the background, without requiring you to click in the Windows User Account Control (UAC) dialog. For more information, see What is the Mozilla Maintenance Service?.
Note: This option may be missing in some cases, as when installing Firefox with a limited user account or when the Mozilla Maintenance Service is already installed.
Choose shortcuts
On my Desktop: You can choose to create a Firefox shortcut icon on the Windows Desktop.
In my Start Menu Programs folder: This will create a Firefox shortcut icon in the Windows Start Menu Programs folder.
After choosing which Firefox program shortcuts to create, click .
The Summary that comes up next will show the folder location where Firefox will be installed.
Check mark Use Firefox as my default web browser if you want Firefox to start up when you open a link in your mail application, an Internet shortcut, or HTML document. For more information, see Make Firefox your default browser.
An Installation Support File Could Not Be Installed
Note: The option to make Firefox your default web browser will be missing if you don't have permission to set Windows Registry keys or if you are installing Firefox over an existing version and Firefox is already the default browser.
If you are reinstalling Firefox over an existing version, you'll see an button instead of an button.
Click or to complete the installation. When Firefox is finished installing, the 'Completing the Mozilla Firefox Setup Wizard' screen will appear.
Morrowind An Installation Support File Could Not Be Installed
Click . This will start Firefox unless you first clear the 'Launch Firefox now' checkbox.
Congratulations, you are done installing Firefox!
Installation Support File Cannot Be Installed
General
Codesys An Installation Support File Could Not Be Installed
How do I install the DLL-file I have downloaded from DLL-files.com ?
Step 1
Open the zip-file you downloaded from DLL-files.com .
Extract the DLL-file to a location on your computer.
If you are unsure about how to extract your zip-file we recommend using File Viewer Plus 3. With it you can open your zip-file as well as over 300 other file formats (like video, music, images, pdf etc.) It’s a handy tool to keep around.
After extracting your zip-file, place the extracted DLL-file in the directory of the program that is requesting the file. Make sure to use a 32bit DLL-file for a 32bit program, and a 64bit DLL-file for a 64bit program. Failure to do so will likely result in a 0xc000007b error.
Step 2
If that does not help your problem, place the file to your system directory.
If the problem still occurs, try the following to register the DLL-file:
For 32bit DLL-files on a 32bit Windows, and for 64bit DLL-files on a 64bit Windows:
Open an elevated command prompt.
To do this, click Start, click All Programs, click Accessories, right-click 'Command Prompt', and then click Run as administrator.
In Windows 8/10, go to the Start screen. Start typing cmd and Windows will find 'Command Prompt'. Right click 'Command Prompt' and choose 'Run as administrator'.
If you are prompted for an administrator password or for a confirmation, type the password, or click Allow.
Type regsvr32 'filename'.dll and press Enter.
Registering 32bit DLL-files on a 64bit Windows:
Open an elevated command prompt, as instructed above.
In the command prompt, start by typing following and press enter:
cd c:windowssyswow64
then type the following and press enter:
regsvr32 c:windowssyswow64'filename'.dll
Finally, reboot your PC one last time to refresh the memory. That should do it!
Why do my DLL files suddenly disappear?
DLL files can be shared between many different programs. If you remove a program using an uninstall utility it might remove all files it installed during the installation process, including DLL files shared with other programs.
An install or upgrade might have failed, leaving out some needed files.
This might also happen if you manually copy the files of a program from one location to another, without using the proper setup process.
Why do I get DLL errors?
Because of the way DLL files work, many of them are included by default in any windows installation. So, when you install a program, it assumes that the information it needs to run is already present on your computer. If a particular DLL needed for operation is missing or corrupted that program will no longer work. It will give a DLL error that you see on your screen.
In most cases, DLL errors appear when programs or files are corrupted by viruses or other malware, or even removed by your anti-virus program after such an infection. Other situations may appear when a file is removed during uninstallation of a program or when removed manually by accident. But it could even be as simple as you trying to run an older program on a new computer, where the old DLL files that the program requires are not included by default in your new Windows installation. The opposite, trying a new program on an older computer is also a possibility for the same reason.
What is a DLL?
DLL stands for Dynamic Link Library, which in short means it’s a library of information, or functions, that can be linked to from different programs that make use of the information in the DLL. It is dynamic in the way that it is a repository with often several hundred functions, and the program linking to it can make use of any of them, or all, as required. The benefit is that programs do not have to include every single function in its own files, instead using the shared DLL, thereby reducing the program size.
A simplified example; ten different programs all need to show some form of button on your computer screen. Instead of each coming with its own button, they all call the same “showbutton.dll” that already exists on your computer. Since all ten programs use the same file, less space is used on your computer.
'filename.DLL could not be found'-error from RunDLL
This is a fairly common error and can be related to your antivirus removing a file perceived as a threat, but not the autostart task or scheduled task to run it:
The simplest way to get rid of the error, is to stop Windows from attempting to load this file.
If you are facing a different situation and a different known program is demanding this file (typically referenced in the error message), or if you are uncertain, contact our support by submitting a ticket above and we can give more specialized help.
How to remove the task attempting to run the missing file;
Download the free program Autoruns by Microsoft.
Run Autoruns (as admin) and find the yellow highlighted Image Paths that ends with the filename in your error message. Usually you can locate those image paths from the tab named 'Scheduled Task'.
Right click any yellow highlighted row ending with the filename and path from the error message, and choose delete.
Try to find all yellow highlighted Image Paths that ends with the filename and path from the error message from 'Everything' tab, delete them.
NOTE: Carefully choose image paths that ends with the filename from the error message only, if you deleted paths that are not highlighted then it might cause some trouble booting your PC.
Reboot Computer
0xc000007b ERROR
Programname.EXE - Application Error
The application was unable to start correctly (0xc000007b). Click OK to close the application.
There might be multiple reasons as to why you receive an 0xc000007b error when trying to run an application on a Windows computer.
This error comes from mixing up 32bit environment with 64bit one. For example, if a 32bit application tries to load a 64bit DLL-file, it would cause this error.
Make sure that you have the correct version of the program for your Windows environment.
Often the 64 and 32 bit versions of a program are the same, but if you get the 0xc000007b error, check your system to make sure which bit version your system is. Check this in the Control Panel - ‘System’ option.
Look for 'System Type' in the window that opens.
If this happens after installing a file with the DLL-Files Fixer, this means you've got the wrong version. Go back and install one of the dll versions with the other bit structure.