BSOD

A blue-screen stop appears when Windows detects an unrecoverable problem in kernel-level code or hardware state. The screen displays a stop code such as SYSTEM_THREAD_EXCEPTION_NOT_HANDLED or IRQL_NOT_LESS_OR_EQUAL and may name the .sys module involved. Windows usually saves a small crash record in C:\Windows\Minidump at the same time. Reading that file with Microsoft's WinDbg tool can identify the module that was active when the failure occurred, which is more useful than replacing every package at random. Note the stop code first, undo any recent driver change, and check whether the same module appears in repeated crashes before deciding that a physical component has failed.