problem uninstalling and reinstalling with newdev.dll

Hi. I have had a problem with my D-Link ADSL USB Modem which I tried
uninstalling using the CD but got this error: 'Errorloading newdev.dll' and
clicked ok then physically deleted all files from the hard drive on my WinXP
SP2 Thinkpad T20 laptop to remove it. It no longer appears in Control Panel,
Add or Remove Programs and no icons remain in Start, All Programs. The
problem is that I cannot now reinstall using the CD due to the above error
again followed by: 'DSL Modem Setup Wizard: The DSL modem is already
installed. To upgrade the software, you must remove the current software and
then run setup again later' but as far as I am aware it should have been
uninstalled already. Is there any way I can get the modem reinstalled? It
seems that it was not uninstalled correctly for some reason and I have no
idea how to get it back. I bought another modem to try out but my laptop
thinks it's the same old modem again when I try to install it(!?) Many thanks
and regards.
Steve Bolton