Hi! Thanks for the quick reply!
Good news, I solved it! As I said before, I had Nahimic disbled but the program was still running in the background so I exited it by right-clicking on the Nahimic icon located at the bottom-right hand corner of Windows. I restarted the sim after that and voilà, it worked perfectly; Fs2crew was able to understand me and the sim stopped crashing at exit.
Thank you so much!