Hello,
It is important to keep in mind that malicious software is, fundamentally, just like any other computer program. The difference is in the actions it takes and/or the intent of the author. In the case of an older malicious program under
Microsoft Windows Vista, the user is going to see the exact same types of prompts seen when they run a legacy application. The main difference is that under Windows Vista, the user will have the opportunity to consider the consequences of running a program. For example, if the user receives an email with a malicious program attached purporting to be a picture, they will not automatically infect themselves by double-clicking on it. Instead, they will be prompted if they want to run the program. Since the prompt came up instead of their picture viewing software, this should serve as a warning that something is wrong and take appropriate action, such as cancelling and then deleting the message.
Regards
Aryeh Goretsky