Error while creating model [Metadata Wizard]

[sram007]

Hi Guys..
I am facing some issues while creating FM models.i have installed Cognos 4.4.1 in Windows 2003 server.Now i can able to see the cognos Connection in IE.
But i can see no sample database in my Cognos8 sample Folder.ican able to see only Cognos_Audit.zip file.. So,
I have created a new DB in SQL server 2008 & trying to create a new model [I didnt impot anything in Cognos Content Admin],I have just created a connection in Cognos Content Admin.
But when i am trying to create model in Metadata wizard im getitng following error,

QE-DEF-0368 Unable to decrypt user name and password credentials from the content store. Review and save the Cognos Configuration settings to configure your reporting environment.

Please guide me..

Thanks & Regards,
S.Ramprakash

[sir_jeroen]

Did you install the samples?