Me again

I have got the game working again. However, upon loading an old save, the game locks up completely. I end up having to reset my PC.
I have done all the usual. I.E update my drivers, but everything was already as up to date as it could be.
I also managed to cancel all running commands on my ships, but it still freezes. usually after about 10 - 15 minutes game play.
I can add further info if required.
Thanks in advance