Dumping physical memory to disk

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).
 
I think you might be referring to a BSoD, if so getting the error codes would be helpful.

If its auto restarting before you get the code you need to go into the bios and change that.