My computer and internet work well most of the time, but at least once a day, and sometimes as many as four times a day, I get that so-called "blue screen of death." It isn't a serious problem, but is pretty annoying if I'm watching a video or listening to music. I'm using Windows 7. Is there any simple way to prevent it?

There are multiple reasons your blue screen of death is occurring. Without any technical diagnosis, there's no way to tell what's causing the problem. Most blue screen of deaths occur due to outdated drivers. Try updating all your system drivers especially your video card driver and see if that fixes the problem.

If your system is older you might consider going inside and do a little house cleaning. Blow out any dust or hair including the fins of the CPU heat sink (if you own a cat or dog this is a must). With the power supply unplugged at the back re-seat all your connections or at least wiggle them in place being careful not to accidentally unplug or knock something off the board unless you know exactly where it goes back. Many times blue screens come on when you add something like new hardware or maybe conflicting programs, think back to when it started and if you made any changes.