Your computer is blue screening. You need to provide more information than that, as countless things can cause this. The blue screen will provide a message about what caused it, we need that message. It will be all caps text with underscores instead of spaces.
For example, IRQL_NOT_LESS_OR_EQUAL is one of the most common causes, and is a result of a faulty device driver (which of course doesn't stop people from blaming Microsoft for bugs in drivers they didn't write, but whatever).