The Error Log is in: Start-->Ctrl Panel-->Admin Tools--> Event Viewer. Yes, it should be "Even Viewer" and not error log. Read This (
http://www.updatexp.com/0xC0000005.html), particularly the Number Two - D.E.P section.
Thanks for that Martmeister.
Problem is now sorted - fantastic!
In fact I couldn't see anything obvious in the event viewer so I just went with your other suggestion of turning off unnecessary services. In particular I disabled nwiz.exe (Nvidia desktop manager related to changing display output?) and a service related to CyberLink DVD (PDVDServ).
And now I see what was making me crash - when I step over that boundary in the game I get a cutscene of the Lungfishopolis evening news. My guess is that trying to play that cutscene was making one of those video services trip up the game.
Though of course it could have been any of the services - but I don't think I'm going to bother going back and turning them back on one by one just to find out!
Thanks for taking the time to reply to my posts - much appreciated!
cheers,
Mandella