Problem:
Rhino 5 64-bit cannot run because of Error 0xc000007b.

Cause:
Windows calls a 32-bit msvcr100.dll when Rhino 5 64-bit runs.

Solution 1:

1. Delete the msvcr100.dll under C:\Windows\System32.
   32-bit DLLs should not exist in the System32 folder on 64-bit Windows systems. It may be mistakenly installed by a 32-bit program's installer.
2. Install Microsoft Visual C++ 2010 SP1 Redistributable Package (x64)
   The 64-bit msvcr100.dll will be installed.
3. Run Rhino 5 64-bit.

Solution 2: If Solution 1 doesn't help, please continue.

1. Download Dependency Walker for x64 from http://www.dependencywalker.com
2. Extract the files in the zip file you've downloaded to a folder.
3. Run depends.exe.
4. Open Rhino 5 64-bit's shortcut icon on your desktop.
   C:\Program Files\Rhinoceros 5 (64-bit)\System\Rhino.exe is opened.
5. Click the header of the CPU column to sort the DLLs with their CPU type.
   
6. Find the x86 DLLs.
7. Press F9 or select Full Paths from the View menu.
8. Find the paths of the x86 DLLs.
9. Delete the x86 DLLs under C:\Windows\System32.
   There's most likely only one x86 DLL found under C:\Windows\System32. Don't delete the x86 DLLs outside of C:\Windows\System32.
10. Install Microsoft Visual C++ 2010 SP1 Redistributable Package (x64)
11. Run Rhino 5 64-bit.

If the Error 0xc000007b happens when Rhino 5 32-bit runs. Use Dependency Walker for x86 to open Rhino 5 32-bit's shortcut icon on the desktop to find and delete the x64 DLLs under C:\Windows\SysWOW64 that cause the error. And then install Microsoft Visual C++ 2010 SP1 Redistributable Package (x86).

Need assistance?
You can save a *.dwi file from Dependency Walker and upload the file for Rhino support team with a comment about Error 0xc000007b.