There is an error between the Realtek ethernet controller drivers downloaded from Microsoft Windows Update and the Nvidia Graphics Drivers.  Please follow the below steps.

1. Download the X58 Network driver by visiting https://www.evga.com/support/drivers and selecting Mainboards --> EVGA X58(Or your motherboard model) --> Network. Please keep in mind that you will want to download the network drivers form your motherboard manufacturers site if it is not a EVGA product.

2. Uninstall the Nvidia display drivers in your windows control panel by opening the add/remove programs or programs and features option and selecting it from the list.

3. Restart windows.

4. Install the Network drivers

5. Install the Nvidia graphics drivers, please note that the most current driver from https://www.evga.com/support/drivers is recommended.

6. Restart Windows.

7. When Windows restarts you should now see your SLI enabled and the system should be fully operational with your SLI configuration.