Internet Explorer Protected Mode
This feature is included in the following editions of Windows Vista:
Internet browsers have become a common avenue for hackers to deliver malware or to try to damage other people's computers. Internet Explorer Protected Mode, available when running Internet Explorer 7 in Windows Vista, provides new levels of security and data protection for Windows users.
Protected Mode provides the safety of a robust Internet browsing experience while helping to keep hackers from taking over your browser, damaging your system and installing software. Internet Explorer Protected Mode helps protect users and their systems from malicious downloads by restricting where files can be saved without the users consent.
In Protected Mode, Internet Explorer 7 in Windows Vista cannot modify user or system files and settings without user consent. Protected Mode requires the user to confirm any activity that tries to put something on your machine or start another program. By ensuring the user consents to these kinds of actions, the likelihood of automated and/or unwanted software installation is reduced. This feature also makes you aware of what a website is trying to do, giving you a chance to stop it and take time to double check the trustworthiness of the website.