<font color=red>Problem solved - I wasn't working in mixed mode.</font color=red>

I am working on a web project and can't get my old login to work on a new install of SQL Server. I get the message

Login failed for user 'sskelton'. The user is not associated with a trusted SQL Server connection. (Microsoft SQL Server, Error: 18452)

and don't know what to check! I can login under windows authentication but need to model limited login profiles for web application purposes. i'm new to 2005 but not to SQL Server in general..