The solution in my case when I posted this was to contact Google who sent me files that disabled the GPU, updating the driver didn't do the trick. The crashes stopped when the GPU was disabled but Nik was painfully slow.
No I have a new machine with a more powerful GPU and everything worked fine for a while then Colour Efex started to crash when I opened it in PS. Google gave me a link to AMD where I got the latest driver and now I think it's working again, I'm not sure because I have not done much work lately.
Bottom line....Nik seems to require a pretty powerful machine both when it comes to RAM and GPU.
Good luck !