typedef struct _WHEA_MEMORY_ERROR
{
     UINT64 ValidationBits;
     WHEA_ERROR_STATUS ErrorStatus;
     UINT64 PhysicalAddress;
     UINT64 PhysicalAddressMask;
     WORD Node;
     WORD Card;
     WORD Module;
     WORD Bank;
     WORD Device;
     WORD Row;
     WORD Column;
     WORD BitPosition;
     UINT64 RequestorId;
     UINT64 ResponderId;
     UINT64 TargetId;
     UCHAR ErrorType;
} WHEA_MEMORY_ERROR, *PWHEA_MEMORY_ERROR;

Windows Vista Kernel Structures