You may not recognize the file name vcomp100.dll, but many programs that use Visual C++ (Microsoft C/C++ OpenMP Runtime) do. This DLL is a crucial system file that is often used in Microsoft Windows. If reading about this file and the possible errors has you panicking, read on below for possible solutions to get rid of the vcomp.dll not found or missing errors.

Follow these steps in the order they are listed below to address the most likely solutions first.

Download and run the Microsoft Visual C++ 2005 Service Pack 1 Redistributable Package MFC Security Update. This will replace/restore the vcomp.dll with the most recent copy provided by Microsoft.

You'll get a few download options for this update, based on the version of Windows you have installed: x86 (32-bit) or x64 (64-bit). If you're not sure which to choose, see How to tell if you have Windows 64-bit or 32-bit for help.