Some suggestions:
1 Can you find the missing DLL on your HDD?
Note the directory you found the file.
2 If found, is this DLL in a recognized path?
2.a Open a cmd window and type path and press enter. It will show all paths added to the environment string.
2.b Check if your directory is included in this string.
3 32 or 64 bit
3.a Check if the DLL is for 32 or 64 bit.
3.b Are you running the code as 32 bit or 64 bit?
A mismatch here will cause this problem.
4. If the DLL is found, use
http://dependencywalker.com/[
^]
It is a good tool for finding missing dependencies.
Maybe it is a another DLL that is missing.
You will also see if it is a 32 or 64 bit DLL with this tool.
That is all I can think of on top of my head.