After I gave my feedback on this issue at the NEC Spectraview web page, Will Hollingworth quickly contacted me and has been working with me to solve this issue. I won't bore you with all the details unless requested, but Will has now duplicated my problem--screen black-out during startup when the SV Gamma Loader is active--on one of his machines. We've determined that the blackout is not a system crash, but rather the video card stops sending a signal to the monitor. It can be restored by unplugging the video cable from the monitor, and then plugging it back in again. Or, the computer can be shut down properly (rather than pushing the Reset button) by the keystrokes CTRL-ALT-DEL, TAB key 3 times, and then ENTER.
Everything seems to point to a conflict between the EVGA video card's NVIDIA driver startup routine and the SV Gamma Loader running at startup. If you take a look at the EVGA and NVIDIA user forums, you will see a firestorm of complaints about serious issues with the latest NVIDIA 64-bit drivers for Windows 7 (and Vista), the 191.07 release (which I am using). So that's most likely where the problem lies. For the moment, I've disabled the SV Gamma Loader on the Startup tab of System Configuration in Win7. I'm hoping that a new release of the NVIDIA driver will be coming soon to address the problems.