A single driver crash is most definitely a (software) glitch and nothing to worry about. But if those crashes start to happen frequently, you have either a severe software problem (that could get fixed by installing a different display driver, using System Restore or ultimately reinstalling the OS) or a hardware problem.
Again, if this happened only once or only during a certain task, don't worry about it.
I was watching a 50min documentary on youtube and typing in a regular word document when all of a sudden, the screen blacked out for a second and this notification appeared on my screen.. Is this something I need to be concerned about, or just my laptop having a little spasm? I'm pretty dense in the computer subject so any comments would be helpful. Thanks!