About using the labview in real time DAQ system

Hi All
    I designed a DAQ board based on PCI bus by myself, using labview for my graphic display application software. DAQ board generate PCI interrupt every 20us(50kHz). then PC respond it and read the data from DAQ board, that means the sampling frquency is 50kHz. the DAQ driver is generated by NI-VISA. it goes well after installing. I am sure that VISA detecte the PCI interrupt and triger a PCI interrupt event every 50kHz.
    But I face a problem, labview can not respond reading data in a real time. so does labview can not be used in the real time system? or is there something wrong with other else? if that is true, how can I solve it?
    by the way, I read the VISA help document. found there are two ways to respond PCI interrupt. one is callback, the other is queuing. I use the second way. I beg your help.

I think you can use buffered signals with some changes on your circuit, with real time can be hard to implement with not supported hardware.
Best regards

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