If you are using OpenOffice with 1.4 Community Final from the setup.exe bundle and it isn't being started, it may be because the start_oo.bat is not being found.
The easiest way to fix this is to edit the alfresco.bat file and change the following line:
if not "%OPENOFFICE_PATH%" == "" call "start_oo.bat"
to (as a single line):
if not "%OPENOFFICE_PATH%" == "" call "%OPENOFFICE_PATH%\OpenOfficePortable.exe" "-accept=socket,host=localhost,port=8100;urp;StarOffice.ServiceManager" -nologo -headless
You should be able to check by seeing the soffice.bin process running (either via the Windows Task Manager or the process.exe in the Alfresco bin folder).
Cheers
Paul.