How do i change the Name of Application in Bowser Tab and in Header?

I am using one Software Product. In this product i want to change the name in tab which is showing when we open this in browser. I will change the name of this by finding out the code (path of the file is: C:.........\product\Header.ascx) and change the name in all Properties file but this is not working. I also restarted the machine and and services of product but no change occur. can anyone help me in this matter.

I am also attaching the screen shot of this.enter image description here