Cannot run clang properly when there is a space in clang path under Windows 7 x64

[fsworld009]

Hi:

I'm using neovim-qt under WIndows 7 x64

When I invoke vim-clang auto completion I get this error:
clang.exe: error: no such file or directory: 'Files\LLVM\bin\..\lib\clang\4.0.0\include"'
I installed LLVM under C:\Program Files\LLVM\ , I think the space in "Program Files" is the cause.

If I put LLVM under C:\ then it works fine.

I can run neomake with clang, I also tried to compile a program with command line directly and there was no issue, so I believe the clang itself is installed correctly.