Cannot find Microsoft Word installed on your system

Hi,

Wonder if anyone can help...

I just tried to generate my printed documentation in RoboHelp and everytime I try I get the error message 'Cannot find Microsoft Word installed on your system'.

It is installed, and when I go to Tools > Options > Tool Locations you can see it is pointing to the right location (C:\Program Files\Microsoft Office\Office12\WINWORD.EXE).

This is the first project I have done with RoboHelp 7.0 on Vista- does anyone have any ideas?

Thanks