have you specified the Ansys license option through LS-RUN and check the env. var box. After restarting the pc, the license should work.
Then, type the LS-DYNA execution command in a windows command prompt. If this works, copy the same command in a .cmd or .bat file and execute the file. Please do not move lsdyna.exe outside the original installation directory of the student package.
I tested the above in my personal pc and it works well.
I hope this helps.