Many customers have asked us about when Protected Mode feature is turned on or off for Internet Explorer in Windows Vista.The Protected Mode feature is available only in Windows Vista. By default, Protected Mode is enabled for Internet, Intranet and Restricted zones while disabled for the Trusted Sites and Local Machine zone.

• User Account Control (UAC) is disabled – If UAC is disabled, Protected Mode is turned OFF. When UAC is disabled, some of the protections which Protected Mode depends on are not available, for example, UI Privilege Isolation (UIPI) is disabled. Hence, Protected Mode is turned off in this scenario.
  
• IE is running with Administrator privileges – Protected Mode is turned off when IE is launched by right clicking on the IE icon and selecting “Run as administrator” or when IE is launched with administrative privileges from another application. This generally occurs when an installer/setup program running with administrator privileges starts a new IE process.
  
• IE is navigated to a local HTML page – When the page being viewed is a local file, Protected Mode is turned OFF since the contents of the page are considered safe. Caveat: If the page was saved from a zone (for example Internet) which has Protected Mode enabled, then Protected Mode is turned ON.