did ya follow these steps?
Please go through the below steps to reset the password from Micorosft SQL server 2005.
Also you must install Microsoft SQL server Management studio before going to the below steps...
Reset the password in Microsoft SQL Server Enterprise Manager
If you use Microsoft SQL Server for the reporting database, you can reset user passwords in Microsoft SQL Server Enterprise Manager.
To reset the password in Microsoft SQL Server Enterprise Manager
1)<SCRIPT></SCRIPT> In Microsoft SQL Server Enterprise Manager, expand the server that runs Reporting Server.
2) Expand Databases.
3) Expand Reporting.
4) Click Tables.
5) In the right pane, right click on the adminuser table, click <SCRIPT></SCRIPT> Open Table and then click Return all rows.
6) Find the user in the user_name table whose password needs to be reset.
7) Replace the existing string in the password table with 6b42f8f5d4e916f55e81c97e0eeafdb1c85fe5bb.
8) Close the adminuser table
9) Click on File and Save and close the window.
10) Log on to the reporting server with the name and password of resetme123.
11) When prompted, change the password.