Please help me.How could this happen?

Hi,I have a PCI card with PLX9656 as a bridge which transfer data from
Local Bus to PCi Bus.The transferring happened in every 30ms and the
amount of data is 16KB.This is a very hard work for me.
My work is to read these datas and send them out by socket and write
them in the hard disk at the same time.Also there will be a GUI to
control where the data would be sent.
The most unbelievable thing happend at this time.When I load the PCI
card's driver, open the interrupt, the system will not work correct.I
lost many datas after I checked the file on the disk and received
through socket.
But I also test my OS with out the PCI card.It's work very well.
Can anyone help to analyze how could this happen?
.

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