Did you read any prior discussions found with http://www.google.com/search?q="trusted+installer"
I am guessing you may need more than the prior discussions and didn't ask.
After I installed W7, I was surprised to find some sort of musical app; just great numbers of 2 or 3 note musical sounds on my Windows Media player. When I attempted to delete I got a pop up stating I could only delete by getting specific permission from "trusted installer". After many hours searching through data, I have got rid of most of the tones but not their base. ?????