OK - we move on but v. slowly!
Have isolated the .pst files.
Uninstalled Office and deleted original download. And downloaded the file
again.
During uninstall the following message came
Error 25090 system error -2147024638
Please open office11\1033\setup.chm to review Office Source engine...
Uninstall continued and was successful.
Then extracted new file and installation interrupted by the message
Fatal error and closed.
Any bright ideas folks?