How to autenticate to local SQL Express server

I have VWD 2005 Express and SQL 2005 Express installed and I would like to convert my access database to SQL. I tried running the upsizing wizard in access and could not connect to the local sql express server. I downloaded and installed SQL Server Migration assistant for Access and same thing, I can not connect to the server. What credentials do I use, I've tried creating an account on the server using the server management utility and adding the user to every role available but still can not connect to the server.What's the error message? You can test connection of the DSN used in Upsizing Wizard in odbcad32.exe (ODBC Data Source Administrator) to see whether it will succeed.