Curves Crash Model

When I try to turn of a layer which has curves on them, Rhino goes to not responding and I have to end to task in task manager. This happens on Shaded view as well as Raytracing (Originally thought it was only if i turned a layer off when in the raytracing view) and is mainly with large amounts of curves such as plans. Any ideas on what a solution could be or is this a bug within rhino?

please run the systeminfo command in rhino and paste the report here.