Vray RT Sketchup Crashes

Hi I am having a problem with Vray RT for Sketchup, it keeps crashing, about every 15 minutes. I have opened a range of scenes, some quite complex, say a 40MB Sketchup file, but also some very simple (just a cube and 3 materials and the sun. I have downloaded the latest drivers for my graphics card, it seems to only do it when RT is open.
Attached my system specs…I cant see this as a common problem on the forum.

oops wrong forum - you should post in the Sketchup forum.
There was discussion of something that may be similar here: http://forums.chaosgroup.com/showthread.php?74477-I-don-t-use-RT

Thanks Andy…I am slowly getting the hang of this forum…will look up now.