Screen flickering has been reported previously with the latest graphics drivers, see here for release notes information
I highly recommend getting customized drivers from your computer manufacturer.
Thanks for your reply.
I wouldn't describe my issue as 'flickering'. The screen blacks out for a second or two. This only occurs occasionally (maybe a few times an hour), usually when something has been clicked that requires a re-draw of the screen. Most often this is whilst playing the Hearts or Freecell games.