Clean imports from Word in the sense of squeaky clean HTML are near impossible but you should be able to get a decent import. It is important that in Word you Save As Web Page (Filtered) rather than just Save As Web Page.
Somehow I doubt that is going to solve this one so the next thing might be a decent find and replace tool such as FAR to seach for ?  and replace it with the correct code.
In the Importing topics on my site I recommend importing each document into a new project for that document. When you have done any cleaning up, then import the topics into the real project.That way if there are any problems you can trash just the temporary project rather than mess up the one with 100 documents already imported.
I am working on a new topic to cover importing into RoboHelp 8 and 9 but a lot of the information you will find is still valid.
See www.grainge.org for RoboHelp and Authoring tips
Thanks for the prompt response Peter and apologies for my tardy response - priorities and all that Digging a little deeper I found issues that I ought to have identified beforehand. The first is that the default encoding setting on for web options on Word was not set to UTF-8. Changing that setting got rid of the spurious question marks. Before I discovered that I did write a simple VB macro to replace the ?  with   which also worked. The formatting wasn't helped by the fact that the word docs were themselves derived from primitive text files so recognizable formatting was negligible. In order to get the bookmarks to import I still had to go the route of converting the word files to HTML beforehand. Thank you once more.