I'll dig one out and try it, if I can. The machine has no free slots so I'll have to remove another card.

I don't think it's that, though. I did delete the original drivers completely then reinstall from new ones from the motherboard manufacturer, and in all other respects the networking runs correctly. I can write to the data fileserver at 60 MB/s, for example, so speed isn't the problem. It's just opening a file that's on it that is the issue.

pca