Thanks for your help Danasan. Okay, some success now - for some reason the game as now started working (after a reboot I think)when run in Windows XP SP3 compatibility mode. I didn't have to set Run as Adminstrator, but have now done so anyway.
Remaining problems:
1) Whenever I run the game windows pops up alert about "Allow Program from an unknown publisher run on this computer" - how do I stop it asking thus?
2) It takes a very long time to start (black screen), but once the Silent Hunter III logo appears, then start quite quickly. The program is installed on a SATA3 SSD drive, so I'm surprised how long it takes to start
3) When I select "View Tutorial" the videos play outside of the game in Windows Media player. I tried installing Direct X 9c, but this doesn't change anything. I don't know if other game videos do this, as haven't got this far - how can I check. Have any other Windows 8.1 users been able to get the videos to play in game.
On the plus side, from what I can tell the 3D graphics run very smoothly, without any tearing or artefacts (as they should with a 970M GPU!)
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