Annoyance With Sign In With Microsoft Passport Network Popup

When I go into Documents and Settings folder, I always get this "popup" window named "Sign in with Microsoft Passport Network" and I don't feel safe even though it probably really is from Microsoft. More so, it's just plain annoying as hell when I'm trying to navigate through Documents and Settings.On another forums board, someone suggested I create a new key in my registry which appeared to be a new key to suppress the "popup". I didn't feel safe doing that even though I've worked in my registry before, because this person who suggested this, didn't have any credentials, just a mere 4 prior posts to that forum, hence I don't feel safe trying that.Can you please tell me how to keep this window from popping up everytime I go into Documents and Settings?