In Win 7 if you use the default path for install (x86) in the program files name.
I have seen some of our customers have issues. It turns out they all have Win 7 and they had installed in the default path. Running as admin solved the issue or they uninstalled Notes and installed again in a different path.
Note this is only for local web preview, I get the feeling now that the poster is trying to preview on the server, so, this would have no effect.
Feedback response number HDGG8GKL2S created by Howard D Greenberg on 05/05/2011