You are almost there. On the Actions tab, create a "Start a Program" action, set the "Program/script" to the full path to the NodeXLNetworkServer.exe program, and set the "Add arguments" to the full path to your network
On a 32-bit English computer, the full path to the NodeXLNetworkServer.exe program looks like this, although you can browse for it using the Actions tab's Browse button:
"C:\Program Files\Microsoft Research\Microsoft NodeXL Excel Template\NodeXLNetworkServer.exe"
The full path to your network configuration file might look something like this:
There is no Browse button for "Add arguments," but if you shift-right-click your network configuration file in Windows Explorer, you can use the "Copy as path" right-click menu item to copy the path to the clipboard and then paste it
into "Add arguments."
Note that double-quotes must be used when a path contains spaces.
I assume that, prior to starting with Task Scheduler, you have confirmed that your network configuration file works properly by running NodeXLNetworkServer.exe from the command line, giving it the network configuration file path as a command-line argument.
You want to do that because if an error occurs when the NodeXLNetworkServer is run from Task Scheduler, the task's window will disappear before you have a chance to read the error message.
Note also that you have to set a "trigger" on the Triggers tab, and that the "Repeat task every" box appears to give you only a limited set of options, but you can actually type any interval into it. And finally, you can test your
new task without waiting for the trigger by right-clicking the task in Task Scheduler and selecting Run.