Not sure if you've solved this problem as it's been over a year but oh well. Even if it helps someone else I guess it's worth it. The error notification "An Administrator has set Policies to prevent this Installation" can occur for more then one reason. Question, is it a personal PC or Business? If it's business, an administrator may have done just that, denied rights to install. If it's a personal PC, it may be something else. This next explaination could be for both