A. Ah, the dreaded blue screen of death! If there's one question I get more than anything else, it might be this one. There's plenty you can do before junking your computer, Anna! My hunch tells me that this issue is a case of bad memory.
Here's how you make sure. Try to load one of my great videos again - this one is a good choice, as is this one. You're just trying to duplicate the error, so any video works.
Once you get the error, look for the error number (It will look like 0X######). In Windows 8, the blue screen gives you more detailed information about what caused the error. Either way, look up the code or message online. Microsoft has a list of what a few common errors mean, too.