This worked for a similar problem with Office 97 - try and see if it does for you:
Open regedit and browse to this key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
You should see htmlmarq.ocx and htmlmm.ocx separate keys. Rename them to something else, ie. htmlmarq.tmp and htmlmm.tmp.
Was able install Office 97, including the HTML option, without incident.
Or, you can download the files at
http://www.dynamiclink.nl
Or, a more sophisticated method of installing the software can be found at :
http://bbs.ondemandsoftware.com/forum/thread-view.asp?threadid=826&posts=5