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You probably unpacked the '3C90x1.exe' and then went into 'Device Mangler' to update the driver, if not, try that.
If you did, then you probably need to try installing all the mobo drivers. If that doesn't work, try removing the offending device and let Windows rediscover it on boot up. Point it to the 3Com folder w/ your unpacked driver files.
As for the 'Unknown' device, well, hopefully that will be cleared up w/ mobo drivers. You can try removing it as well, but it will probably just come back as 'unkown' again.
What model mobo is it? Does it have anything onboard? Did you install all the drivers for sound, modem, etc . . .
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