Problem In Crystal Report

Dear Friends
I have  made a application in C#. In which there is crystal report. But it is asking for login id and password when i deploy it and install on client machine. but my database which is sql server 2005 and client database sqlexpress has windows aunthentication itself while installing. ihad not check on mixedmode authentication.even it is asking for login id and password on onlyt client machine
please suggest quick solution