Windows Start-up Icon problem

[zurk12]

Soo I have this problem and I dont know what to do. I tryed installing some theme packs and the one I tryed was for the Mac look and it wanted me to put files into the windows and the system folder, and now i want to go back to the default which is the windows logo instead the apple logo.
http://img25.imageshack.us/img25/6483/capturetk.jpg

 

[torrentg]

Advice: Do not alter system files unless you are absolutely sure how to undo changes. Or how to fix pc when you break something.

Run sfc /scannow from elevated command prompt.