Thanks - I've run the Repair permissions and hope that this fixes things. I don't have any virus detection I know the problems they can cause and I haven't put any old control panel things on but of course have all my old programs from the G4....
The RAM should be ok, but not sure about it being seated or not???? I dont have any programs on when I'm on the internet which seems to be when it happens. Maybe something to do with the Bigpond wireless program?