Welcome: as ReadOnly - Cannot gain admin access after install


I installed Tackle on our Windows 2003 SP2 web server. The
installation went well - no errors or warnings encountered.
The database was installed on a Windows 2003 server with SQL Server
  1. The database name is Tackle. I entered my SQL Server user name
    (myUserID), which is incidentally my NT domain user ID as well.

When I invoked the main web page the first time, the application
displayed a Tackle session timed out error message. Since then, when
I go to the home page, I have minimal rights - like guest mode.
With tne updated master pages, this is what I see in the right hand corner of the page:
               Welcome: as ReadOnly 
Thanks in advance!