The modern Blue Screen of Death (BSOD) is nothing like the BSOD of yesteryear. Usually now it means it can fix itself. Possible causes are numerous. If the laptop has been dropped, it is possible the RAM or other connectors are slightly loose. I'd suggest taking it to a proper shop instead of trying to take it apart yourself. On the software side, there are some tools buried deep in the menus to verify the install of Windows and fix any corrupted files. Again, I suggest finding a reputable repair shop unless you have a tech-savvy grandkid handy.