have you noticed, that the current driver cant installed as some reason ? May be try a complet re-installation.
You own a very low end system ( i7-6700, 8GB RAM, gtx 970 ( 4GB, only 3.5 fast ) ) - e.g. the 970 is significant slower than a 980ti and the 8GB needs to lower all memory intensive settings e.g. precache .
I would start with the default “Low” setting and then you can go stepwise with the settings higher. Possible might also to start with “Medium” and reduce then specific settings in case of performance issues.
EDIT: Lol… now noticed the OP post was some months old… adding the min-specs here in former post, confused me a bit 
… its assumed a dead topic.
By the way: I assume the official min-specs are menntion within the FAQ: