Issue
You are unable to open or start AutoCAD or F/X CAD, and your received the following System Error message:
The program can't start because VCOMP100.DLL is missing from your computer. Try reinstalling the program to fix this problem.
Cause
You appear to be missing the Microsoft Visual C++ Library, which is preventing CAD from starting.
Solution
Download and install the Microsoft Visual C++ Library, linked here.