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LTSpice Tutorial: Part 1
How to enter/edit schematics, open up pre-designed 'jig' files, configure voltage sources, run the simulation, probe currents and voltages
The 74HC04 logic inverter and simple switch are not standard models in LTspice.
There is a device labeled "sw" which is a voltage controlled switch that can be used for the switch in your diagram. Otherwise there are some switch models located at the Yahoo LTspice Users Group.
I believe the Yahoo LTspice Users Group also has a 74HC library which you can download and install. The LTspice manual tells you how to install additional libraries.
If you just need a generic model, there is a "inv" device in LTspice that performs the ideal inverter function.
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