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//0x4 bytes (sizeof)
union _WHEA_ERROR_PACKET_FLAGS
{
    ULONG PreviousError:1;                                                  //0x0
    ULONG CpuValid:1;                                                       //0x0
    ULONG HypervisorError:1;                                                //0x0
    ULONG Simulated:1;                                                      //0x0
    ULONG Reserved:28;                                                      //0x0
    ULONG AsULONG;                                                          //0x0
};