check your wife's boyfriend name... LOL...
this being said, did you just notice it ?
Did you buy the PC new ? Sometimes chaps in computer store, do not do a clean install, and keep the "roaming profile" for installs, with a recent update the conditional trigger ( 0 to 1) might get updated, and the said profile becomes visible on the welcome page.
in the registry one shall find the entry of the "boyfriend" and delete the user from there..