Getting 100-200ms latency from data rec'd to program action. Any ideas?

We are trying to isolate an apparent 100-200ms latency from data xmitted to NI485/4 and program response. Using win2k with virtually no CPU being used. Code appears to be well written and has system priority. We have Intel D845GBV2 board and have three PCI cards, NI485/4, Data xlation 3153, and I/O card.
I suspect PCI problems. The NI 485/4 works fine except for latency and installation shows no problems except for memory address conflict between each of the four ports, however I suspect this is not a problem as all four ports are on the same card.
Any suggestions?

Chris,
Thanks for the fast reply. I reloaded the driver (but did not physically remove card as of yet; system is installed in cabinet and not easily accessed). System shows card working properly under "Device Manager"; no exclamation points or other symbols show up on the ports. However, when I right-click and check properties| resources tab for any one of the used ports (three in my case)it shows the memory address as also being used by the other two active ports. I appear to be unable to change the memory I/O at this screen as settings are grayed out.
If you can confirm this is not a good situation, I will investigate further. Thanks again

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