To disable NVIDIA Physx GPU acceleration:
1) Right-click over your Windows Desktop and select "NVIDIA Control Panel" from the context menu
2) From the NVIDIA Control Panel, select "Set Physx configuration" from the left column
3) On the right panel, from the drop down menu option labeled "Select a Physx processor" CPU. Next, select "Apply" to complete these changes. This will disable NVIDIA Physx GPU acceleration. Any physics computation will be handled by the CPU.
