Norton System Works

I use XP. Recently, on rare occasions when I click on the desktop shortcut  for NSW Premier Edition,the PC screen  shuts down and the PC is still humming.The only way to get up and running is to hit the restart button. 

How can I analyse what is happening either via Norton itself or Windows?

 It's frustrating simply because  it is a recent problem but may have begun after I upgraded Norton Internet Security  to 2012 and wonder whether there's a built in conflict. Any ideas?????