'Network ID' button disabled

Hi all,
in the morning i had problems on Windows 2000 Professional and i needed to
reinstall some drivers.
Now the only problem is the network (based on TCPIP):
- if i login in into the domain i cannot see the network and its resources
- pinging and navigating external addresses are good
- 'Network ID' buttons are disabled, so i cannot re-trust the PC with the
Windows 2003 server

How can i solve ?
At least, is it possible to refresh Win2000 installation without loose all
the users data ?

Thanks !!!
--
SM


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