The software you download and use can still receive updates for the entire life of an Android device. But the core software can only receive security updates in til a certain point. Unless you take matters in you're own hands and install a rom like cyanogen. I personally think it's best to pass...
quick suggestion, replace the windows startup sound.wav file
not sure it works but worth a try, here is the link( not sure if i can post a link but here goes)
http://www.youtube.com/watch?v=jcKtXwMVnqI
youtube link to show how
good luck