Face Problem in Modelsim-altera started edition

i am a beginner in learning modelsim. A lot of problems i faced:

Question:

1. How to set the eda tools of simulation to altera-modelsim permanently? Each time i open a new project and need to set repeatedly.

2. I use the native link method to run the simulation of a simple counter. The simulation can’t run no matter I click run, run all and run continue. Then, I click simulate.

Then an error obtained:

# ** Error: (vsim-19) Failed to access library 'C:\altera\91\modelsim_ase\win32aloem/../altera/verilog/cycloneiii' at "C:\altera\91\modelsim_ase\win32aloem/../altera/verilog/cycloneiii".

# No such file or directory. (errno = ENOENT)….

Then, I click step, the simulate start run again.

May i know how to solve it?

thanks a lot