Yeah, the best thing to do would be find out what the program is, and hit ctrl+alt+delete. Go to processes, show all users, and end the process for that user.
I remember about ten years ago, we had fiber lines running to our house for my dads work, and we used them for our personal stuff as well. I was eight years old at the time, and they had a block. Took me probably half an hour to do away with that.
I also remember the days of a hard drive attached to a USB adapter on the schools computers, and even some friends computers.
That worked pretty well for a while, but you would get the occasional problem where linux just goes "hm, we don't like your hard ware, find the drivers and try again".
I'm on the computer probably forty to fifty hours a week.