We received this alert from NVIDIA and they have asked us to share it with our readers:
We are aware that some customers have reported fan speed issues with the latest 196.75 WHQL drivers on NVIDIA.com. Until we can verify and root cause this issue, we recommend that customers do not download this driver. Instead, please stay with, or return to 196.21 WHQL drivers. Release 196.75 drivers have been temporarily removed from our website and we also are asking our partners and others to remove temporarily this 196.75 WHQL driver as well.
Here’s a link for instructions on how to roll back your driver - Rollback Instructions
Click here to discuss this issue in the OCC forums.