Jenny100: Do you mean start again from the beginning or quit the game and restart from my save game? If you meant the first I'd be reluctant to play through most of the game again when I'm not that far from the end. If you meant the latter, yes I did this.
satch: I don't think there is an option to do this in the game, but I did try all the options it offered. Which were not extensive.
Thanks guys but I'm going to try a smaller install and see if works afterwards.