A Blue Screen of Death (also known as a stop error, BSoD or bluescreen) is an error screen displayed by certain operating systems, most notably Microsoft Windows, after encountering a critical system error which can cause the system to shut down to prevent damage. Bluescreens can be caused by poorly written device drivers, faulty memory, a corrupt registry, or an incompatible Dynamic-link library (DLL). Bluescreens have been present in all Windows-based operating systems since Windows 3.1; OS/2 and MS-DOS suffered the Black Screen of Death, and early builds of Windows Vista displayed the Red Screen of Death after a boot loader error. The term "Blue Screen of Death" originated during OS/2 pre-release development activities at Lattice Inc, the makers of an early Windows and OS/2 C compiler. During porting of Lattice's other tools, developers encountered the stop screen when NULL pointers were deref

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