Did you try Help > SOLIDWORKS Tutorials ?
Or did you browse for installed training files and start opening them?
The training files you can download from All SOLIDWORKS Training Files | Training Files | SOLIDWORKS are intended to be an accompaniment to the SOLIDWORKS courses offered by resellers and the training manual provided during that course. They were not intended to be standalone files sets.
If you are working on your own, I would suggest either the built in tutorials (located on Welcome Screen and Task Pane, files sets included), My.SolidWorks lesson and ecourses (video and training courses).
A really excellent resource that many people don't realize is there is hidden under the Simulation, Help down menu. This links to the tutorials mentioned above but also Verification problems and NAFEMS Benchmarks. These a wizard based tutorial with included files as well. Have fun!