SC_HANDLE service = CreateService( scm,
                                        driverName,
                                        driverName,
                                        SERVICE_ALL_ACCESS,
                                        SERVICE_KERNEL_DRIVER,
                                        SERVICE_DEMAND_START,
                                        SERVICE_ERROR_NORMAL,
                                        driverExec,
                                        NULL, NULL, NULL, NULL, NULL );

    SC_HANDLE service = OpenService( scm, driverName, SERVICE_ALL_ACCESS );
    if( service != NULL )
    {
        result = StartService( service, 0, NULL ); //Возвращает 0
        if( !result && ( error = GetLastError() ) != ERROR_SERVICE_ALREADY_RUNNING ) //GetLastError = ERROR_FILE_NOT_FOUND
        {
            std::cout << "Error: " << error << std::endl;
        }//if
    }//if

#define DRIVERPATH _T("C:\\Windows\\system32\\drivers\\Drv000.sys")
....
//где-то в коде
InstallDriver( scm, DRIVERNAME, DRIVERPATH ); //внутри этой функции непосредственно вызывается CreateService(...)

ImagePath = System32\Drivers\Drv000.sys

status = SomeDirectoryFileOperation(...) // тут отгребаем ERROR_FILE_NOT_FOUND
if !NT_SUCCESS(status) return status; //ERROR_FILE_NOT_FOUND

_>Попробую немного потелепатить и пофантазировать Есть ли в DriverEntry код, подобный этому?

_>status = SomeDirectoryFileOperation(...) // тут отгребаем ERROR_FILE_NOT_FOUND
_>if !NT_SUCCESS(status) return status; //ERROR_FILE_NOT_FOUND
_>

NTSTATUS DriverEntry(IN PDRIVER_OBJECT DriverObject, IN PUNICODE_STRING RegistryPath )
{
    NTSTATUS status = STATUS_SUCCESS;

    PDEVICE_OBJECT fdo;
    UNICODE_STRING devName;

    DriverObject->DriverUnload = UnloadRoutine;
    DriverObject->MajorFunction[ IRP_MJ_CREATE ] = Create_File_IRPProc;
    DriverObject->MajorFunction[ IRP_MJ_CLOSE ] = Close_HandleIRPProc;
    DriverObject->MajorFunction[ IRP_MJ_READ ] = ReadWrite_IRPHandler;
    DriverObject->MajorFunction[ IRP_MJ_WRITE ] = ReadWrite_IRPHandler;
    DriverObject->MajorFunction[ IRP_MJ_DEVICE_CONTROL ] = DeviceControlRoutine;

    RtlInitUnicodeString( &devName, L"\\Device\\Drv000" );

    status = IoCreateDevice( DriverObject, sizeof(EXAMPLE_DEVICE_EXTENSION), &devName, FILE_DEVICE_UNKNOWN,
        0, FALSE, &fdo );

    if( !NT_SUCCESS(status) ) return status;

    PEXAMPLE_DEVICE_EXTENSION dx = (PEXAMPLE_DEVICE_EXTENSION)fdo->DeviceExtension;
    dx->fdo = fdo;

    UNICODE_STRING symLinkName;
#define    SYM_LINK_NAME    L"\\DosDevices\\Drv000"
    RtlInitUnicodeString( &symLinkName, SYM_LINK_NAME );
    dx->ustrSymLinkName = symLinkName;

    status = IoCreateSymbolicLink( &symLinkName, &devName );
    if( !NT_SUCCESS( status ) )
    {
        IoDeleteDevice( fdo );
        return status;
    }

    KeInitializeSpinLock( &spinLick );

    return status;
}