Trying to run a SSIS package through a bat file in app server

I have the following command in a bat file

"C:\Program Files(X86)\Microsoft SQL Server\100\DTS\Binn\DTExec.exe" /f "E:\Scripts\SSISPackage.dtsx"  /Connection "E:\Scripts\Config.dtsConfig"

PAUSE

I get the error saying "The System cannot find the path Specified"

The SSIS package works fine in the BIDS. I have created a config file using SQL SERVER Authentication which has credentials of a service account and am using this config file in bat. How can I run this package. Is there an error with tha batch command or is it because of SQL Server Authentication. I can see the username in the config file but not the password.Is this the problem?If it is how can I use password in config file.