How to Fix Msvcr100.dll Not Found or Missing Errors

1. Download the Microsoft Visual C++ 2010 Service Pack 1 Redistributable Package MFC Security Update and run it. This will replace/restore the msvcr100.dll with the most recent copy provided by Microsoft. You're given several download options from Microsoft for this update, based on the version of Windows you have installed - x86 (32-bit) or x64 (64-bit). 
2. Run a virus/malware scan of your entire system. Some msvcr100.dll errors could be related to a virus or other malware infection on your computer that has damaged the DLL file.
3. Copy the msvcr100.dll file from the \System32\ folder and paste it into the \SysWOW64\ folder. This works if you already have the DLL file in the 32-bit folder (System32) but are having troubles with 64-bit programs accessing it. The full paths of these folders are C:\Windows\System32 and C:\Windows\SysWOW64\. Just right-click and copy the DLL file from the first folder, and then paste it into the second.
4. Install pending Windows updates.
5. Download dll fixer and scan your pc, it's automatically updated missing dll files