RUN: C:\Program Files\Microsoft SQL Server\80\Tools\Binn\SVRNETCN.exe

This is the SQL Server Network Utility.  Enable Name Pipes and TCP/IP.  Then try running OSQL -E at a command line.

However, please note that your workstation's SQL instance will be visible to others.  Therefore, domain administrators would be able connect to your SQL Server.

Let me know if this works.

Ryan