I had the same problem, and thanks to the friendly people here I was able to delete it. First of all don't worry, it wont harm you, its like a program. First tell your friend to press Ctrl Alt Delete if he sees it there, take it off. What I did then is I went to the search function in Windows. If I remember correctly, the name was "choke.exe".... search for it, erase anything with that name. Just restart and your set.