Guys i finally did it.i found where the taskbar pinned shortcuts are stored and changed it from there.similar to right-clicking on the taskbar icon changing the icon of the shortcut did nothing,but i aimlessly created a copy of the shortcut and somehow it worked!.again sorry for my bad english 
C:\Users\Emertat-pc\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar
as u can see in the picture MB is running,only one icon is shown in the taskbar and it is the icon i wanted.i still can't figure how making a copy of the file made the problem go away...
http://oi57.tinypic.com/2h58b5i.jpg
I was tryna figure this out too, and your comment helped me. Thanks!
