Free Mystery Microsoft Security Tool for Windows

A ZDnet blogger opines this is The one security tool every Windows user should know about - the Enhanced Migration Experience Toolkit.

It blocks the execution of program code at memory locations that should contain only data, such as the stack or the heap, preventing a common hacker's trick. It also mitigates against common tricks that hackers use to exploit flaws in code, by blocking common “heap spraying” techniques, by validating exceptions before calling an exception handler, and prevents attackers from jumping to predictable memory addresses to exploit vulnerabilities in code.

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