When I say artifacts, I mean things like, missing polygons. eg in half life 2, there are times when you can see straight through a small section of one of the characters faces.
The graphics card is good and this problem has happened to quite a few people. I have the nvidia tool and I know the card isnt overheating.
All I need to be able to do is to get into the troubleshoot tab in the advanced settings of the standard windows display dialog.
ie right click on desktop>personalise>display>advanced>troubleshoot