We're getting way OT - but before we close out this discussion here in this topic I should say that it may not be an isolated incident. Those Data Execution Prevention errors can crop up out of nowhere, and sometimes they're very hard to impossible to get rid of They're supposedly doing a good thing - but they're often more a pain in the ass than anything else. For example, I have a friend who installed the software to use Amazon's Unbox Video player (to download/watch movies to his computer) but every time he tried to open the files he'd downloaded or even open the directory they were downloaded to, he got a DEP error and either the Unbox software crashed or Windows Explorer crashed. He spent hours with Amazon support and no one could get to the bottom of the problem. Finally he just gave up.
Weird, yes. But that's Windows if you ask me. And what's weirder is that millions of other people apparently us the Unbox software without any problems whatsoever...
If you ever see the same error again, write it down and start a topic on the Testing board because I'm curious as to what it says.