According to this document and my own experience. MiKTeX 2.9's version of tex4ht is not working. Using MiKTeX 2.8's tex4ht does work, but is obviously not prefered. Does anybody know how to fix MiKTeX 2.9's version of tex4ht?
[Tex/LaTex] MiKTeX 2.9’s tex4ht not working
miktextex4ht
Best Answer
Did you install it using the 'user' package manager?
I've had a similar problem myself and did a clean and re-install, this time making sure I added tex4ht-base with the 'admin' package manager.