Decided to reinstall to investigate game problems.
I followed the following procedure:
1.Uninstalled RS II with uninstaller.
2.Deleted the contents of the Roma Surrectum II folder. (which still contained some RS II files).
3.Installed RS II unto a completely new, empty, folder. This was wrong see later posts. Do not do this.
4.Ran Wise Registry Cleaner.
5.Copied the contents of Rome - Total War folder to C:games\Roma Surrectum II folder.
6.Copied the contents of Roma Surrectum II install folder to C:games\Roma Surrectum II folder.
Again wrong, just run the RSII installer into C:games\Roma Surrectum II folder.
7.Confirmed folder replace. Should be unnecessary.
8.Confirmed copy and replace. Should be unnecessary.
9.Copied new shortcut to my games startup folder. Still do this as it seems to improve how the switches are applied. It seems that the switches saved on the first use of the launcher are the ones saved and changes must be added each launch.
10. started launcher and applied appropriate choices and switches.
Ran the game, no more CTDs (Got that wrong see below). Did reduce the graphics games window size, so might have been that (mea culpa).
Still wondering about how to take good screenshots for the campaign though.