This thing appeared after the recent Windows Update - an EULA appeared that I duely accepted (without reading of course, these things are dull. It just registered as ahhh, this sounds good) and then ... nothing. No explanation, no dialogs, nothing in Control Panel Add/Remove programs, nothing in Program files, not listed as an update. Where did it go I wondered, how am I supposed to use it?
It didn't go anywhere and you don't use it is the answer, as described in this Microsoft Knowledge base article. An even quicker summary, look in %windir%\debu\mrt.log to see when it last ran and what it found (if anything).
I think if they do this sort of thing again there should be more than a simple EULA, perhaps there was, but it should be clearer as to what is going on.