Without any explaining..here is the step.
1. Install nvidia graphic card driver.
2. Reboot.
3. Install Microsoft Visual C++ redistribution (64-bit)
4. Reboot.
5. Install nTune (5.0.5.25)
6. Reboot.
7. Reinstall nvidia graphic card driver (do not uninstall the original installation)
8. Reboot.
It worked for me but may not work for you. I have nForce4-x16 chipset; just fyi.
1. Install nvidia graphic card driver.
2. Reboot.
3. Install Microsoft Visual C++ redistribution (64-bit)
4. Reboot.
5. Install nTune (5.0.5.25)
6. Reboot.
7. Reinstall nvidia graphic card driver (do not uninstall the original installation)
8. Reboot.
It worked for me but may not work for you. I have nForce4-x16 chipset; just fyi.