IBM T30 network card drivers installed or why not open the page?

I use the 2M Netcom, installed drivers why sometimes beat the speed of the page very quickly, and sometimes the page will show:The page can not be displayed
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interface card may be the R40, I defects
The same is true of gas later I change anything on the USB adapter to solve the
another USB adapter is the first try To determine your computer's software with the hardware
Second, there is no problem you have to judge your speed is not normal.
You do to your computer or network is easy to find the problem.In the end card is still the issue of Netcom.