http://nakedsecurity.sophos.com/2013/02/01/ie-10-is-more-secure-prevent-update/
IE 10 is more secure, so here's a Microsoft tool to prevent you updating by mistake
"Big deal," you say. "There is no IE 10 for Windows 7, so it doesn't sound like much of a tool to me."
Except, as The Reg points out, the availability of the tool is a sort of omen: it surely means that IE 10 for Windows 7 must be nearly ready to drop for real.
Ironically, then, Microsoft is making sure that as soon as IE 10 is ready, you're already ready to avoid it.