Internet Explorer - Updates - Patches - Data Execution Prevention DEP Errors
Internet Explorer 8 security features target three major sources of security exploits: social engineering, Web server, and browser-based vulnerabilities. IE8 Data Execution Prevention (DEP), a feature that mitigates browser-based vulnerabilities.
DEP/NX Memory Protection in Internet Explorer 8 Internet Explorer 7 on Windows Vista introduced an off-by-default Internet Control Panel option to “Enable memory protection to help mitigate online attacks.” This option is also referred to as Data Execution Prevention (DEP) or No-Execute (NX).
DEP/NX helps to foil attacks by preventing code from running in memory that is marked non-executable. DEP/NX, combined with other technologies like Address Space Layout Randomization (ASLR), make it harder for attackers to exploit certain types of memory-related vulnerabilities like buffer overruns. Best of all, the protection applies to both Internet Explorer and the add-ons it loads. No additional user interaction is required to provide this protection, and no new prompts are introduced.
DEP/NX Compatibility
For Internet Explorer 7, DEP/NX was disabled by default for compatibility reasons. Several popular add-ons were not compatible with DEP NX and would crash when Internet Explorer loaded them with DEP/NX enabled. The most common problem was that these add-ons were built using an older version of the ATL library. Before version 7.1 SP1, ATL relied upon dynamically generated code in a way not compatible with DEP/NX. While developers of many popular add-ons have since released updated extensions compatible with DEP/NX, some add-ons may not be updated before Internet Explorer 8 becomes available.
http://www.microsoft.com/windows/downloads/ie/getitnow.mspx
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