I have a hitachi visionbook pro 7000 series laptop.  I had window NT
on it up thought I would upgrade to Windows 2000 Professional.  
That was my first mistake!
Now my US Robotics 56K internal modem will not work.  I suspect that I
need windows 2000 drives to drive this thing.  Where can I get them?
When I remove the device my computer detects it again and says 16550
(I guess that may be relevent in your search for the correct driver).
I need to know where to download the windows 2000 driver.

Hello crabapple,

I would say that it would probably be best to go back to Windows NT.
If you want to keep Windows 2000, then you might have to find a new
modem. After extensive searching I was unable to find this driver for
you.

The US Robotics website has some OEM drivers but I did searches for
your product and tried to match it up, without any luck.
http://www.usr.com/support/s-modem/s-modem-oem-downloads.asp

You could try contacting Hitachi directly. Here is a customer support
contact:
http://www.histore.com/Apps/HitachiContact/CustomerSupport
You can also call 1-800-Hitachi

The best of luck to you,

tisme-ga

Checking the Hitachi Specs for your model: 
http://www.hitachipc.com/notebooks/vbp6000.html
lists Win95, Win98 and WinNT, with upgrades for those systems, but
does not mention Win2K at all.

The US Robotics site has upgrades here:
http://www.hitachipc.com/notebooks/vbp6000.html
with a link below, which you might check.

Sorry I couldn't find particular support for your Model notebook with
that integrated USR modem.

Serenata

Hi, 

Please check this out:

"Win2000 Modem  Drivers:
 
3Com / US Robotics Most models have drivers on the Windows 2000 CD.

Or download this INF file for support on these models:
00568603, 00568703, 04563001, 04566801, 09563001, 18563001, 24563001,
24566801, 24562501, 45566801, 45563001, and 99563001.

Download 3com or Driverzone.com"

[ http://www.driverzone.com/w2kmodem.htm ]

warm regards
vinods-ga

Also you can try to install your modem as a generic one, sometimes it works.

Thank you to everyone for the comments - they were helpful.  I managed
to use a standard driver but it is only 28K.  It works but kind of
slow and I can't hear the dialing.  Atleast it works.

I believe 16550 is the chip type of the serial port. It may not be
related to your modem.