OH MY GOD! THANKYOU!!!
I couldn't find "FileMaker Pro 7.0D Prefs" in one of the many library files, then did a search, and it came up with Filemaker this and that, 6 and 7 from previous installations, so i just deleted the whole bl**dy lot and BOOM - reinstalled the baby, and off she goes!!
We have a winner!! dkemme!
Thankyou so very much to those who took the time to help me out!
Thankyou!