The newest NVIDIA Display Drivers are fucked up. After installation CUDA technology will not be available anymore.
There is a lot of crying on the GeForce Forum about that. However Cyris found a solution to that problem, you may find it here or here. Both topics contain links to download fixed NVIDIA Driver Package 340.52. Mentioned package is full, if you want a slim version of it, with only Display Driver and PhysX (without: NVIDIA 3D Vision Technology, nor NVIDIA Network, etc.) you may download it from Dropbox, link below.
NOTE:
• Before installation please disable Digital Signature Check for Drivers (turn it on afterwards).
• Disabling your Anti-Virus/Malware protection for a time needed to install may be a good move.
• You may be asked if you want to install unsigned Driver – youp, you want.
• …it works.