If you receive the following in the Application event log:

Event ID: 1000                              Event Source: Userenv                              Description:                              Windows cannot determine the user or computer name. Return value (1722),
your preferred DNS server address on this client may be unreachable.

NOTE: This may result in a very long logon time.

To correct the problem:

1. Right-click My Network Places and press Properties.

2. Right-click Local Area Connection and press Properties.

3. Press Internet Protocol (TCP/IP) and press Properties.

4. In the Preferred DNS server box, type the correct DNS server address.