Connecting to SQL Server

I installed MSDE today using the setup.exe file, so the syntax was

setup SAPWD=mypassword securitymode=SQL

it worked, I reboot and I see the SQL Server running...

I opened my web matrix, went into the data section and tried to make a new connection to then create databases etc, and it bombs...

I click on SQL Authentication
username sa
password mypassword
and I tried to create a new database

it says either SQL doesn't exsist, or access denied...

any idea's what I did wrong?

Thanks
CadenUPDATE:

I downloaded the new web matrix and everything works just peachy now