Automated backup for SQL 2005 Express?  Without showing password.

I need an automated backup for SQL 2005 Express.  
I used studio manager to create the backup script.
I am currently using task manager to run the script.
How can I run it without showing the username and password?

Here is what I know:
C:\Program Files\Microsoft SQL Server\90\Tools\Binn\SQLCMD.EXE -S [SERVER] -U bakupadmin -P [PASSWORD] -i D:\backup\sql\SQLExpressBackups.sql

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