Recently I bought a new computer with windows 10 as the OS. I moved the hard drive from my old computer, which was windows 7, onto the new one. I boot my computer from the new one so I decided to re download GOG Galaxy onto the new hard drive. However, once I started it up i got an error stating
"The program can't start because mfc140u.dll is missing from your computer. Try reinstalling the program to fix this problem."
So i reinstalled it, but with no luck. I downloaded this specific file and added it to the GOG Galaxy folder only to be met with another error.
"The application was unable to start correctly (0xc000007b). click OK to close the application."
Is there anyway to fix this? Thanks in advance.

If you download and install this it should fix the missing dll error: https://www.microsoft.com/en-us/download/details.aspx?id=30679
LOL, moonshine was quicker on the draw :)

Thanks for the help, it worked :)

The solution from moonshine above worked for me as well. Thank you.

I had to uninstall the one .dll beforehand which was pre-existing on my PC. Once I installed the moonshine dlls (.86 and .64), I had to redo the setup for witcher 3. I also had to install GOG Galaxy to play the game. I did a search and located some info from Autodesk. I followed the autodesk directions but only deleted the pre-existing file that I needed for witcher 3 in bold below with *****. here is the link and cut/paste from autodesk.

[i]https://knowledge.autodesk.com/search-result/caas/sfdcarticles/sfdcarticles/How-to-remove-and-reinstall-Microsoft-Visual-C-Runtime-Libraries.html

Issue:
You would like to know how to remove and reinstall the Microsoft Visual C++ Runtime Libraries in order to correct a problem with your Autodesk software, such as a "general failure" during installation (due to a conflict with installer prerequisites) or any type of misbehavior or crash during normal operation.

Solution:

Uninstalling Visual C++ is done the same as other programs. The different versions and components will be listed in Programs and Features (or Add or Remove Programs for Windows XP). To uninstall Microsoft Visual C++: ​
1.Open Programs and Features from the Windows Control Panel (or Add or Remove Programs for Windows XP). A simple way to bring this up on non-Windows XP systems is to type "programs and features" in the search field at the bottom of the Start menu.

2.In the search field at the top right, type in "c++ redist" (without quotations).

3.Uninstall everything that shows "Microsoft Visual C++" and "Redistributable" (which should be the entire search results list).

Download and install all of the following:

Microsoft Visual C++ 2005 SP1 Redistributable (x86)
Microsoft Visual C++ 2005 SP1 Redistributable (x64)
Microsoft Visual C++ 2008 SP1 Redistributable (x86)
Microsoft Visual C++ 2008 SP1 Redistributable (x64)
Microsoft Visual C++ 2010 SP1 Redistributable (x86)
Microsoft Visual C++ 2010 SP1 Redistributable (x64)
Microsoft Visual C++ 2012 Update 4 Redistributable (x86 and x64)
Microsoft Visual C++ 2013 Update 5 Redistributable Package (x86 and x64)
Microsoft Visual C++ 2015 Update 3 Redistributable (x86 and x64) ******
Microsoft Visual C++ 2017 Redisutibutable (x86)

Notes: •The file names for each download are the same, so be sure to not overwrite a prior one before installing it. Download one, install it, then download the next, install it, etc.
•Both the x86 and x64 versions are needed on 64-bit systems. Only the x86 versions will work on 32-bit systems.
•Beginning with the 2012 version of Visual C++, Microsoft provides the x86 and x64 downloads through the same link. Select both files in the list and download them.
•Version 2013 of Visual C++ is a special download. From the above link, choose both the x86 and x64 versions for your locale.[/i]