Win XP sp1, Messenger version 4.7.2009. This is a fresh, fully patched install, next to nothing on my machine. I launch Messenger, it works fine. When I close it, it minimizes to task bar. I right click, select exit, I get a popup window saying that other programs are using features provided by windows messenger. In fact no other programs are open. Task manager will kill it normally. What's going on??