New messeges steal window focus

I'm having an intermittent problem, on just one computer running XP Pro w/
SP1, that when I get a message, that window will steal focus from whatever
else I'm doing. It'll open up a minimized window, steal focus from Photoshop
when my mouse is still clicked, minimize a full screen game to show me the
window, etc. I've looked through all the options but I didn't see an option
to turn this on or off, but you know how you can look straight at something
and never see it.

I also have a problem on all my computers with various versions of Windows
XP that WLM doesn't recognize that I have checked a new message, and
continues blinking until I minimize and pull the window back up. However,
this problem isn't nearly as irritating.

I'm using WLM 8.1, with and without Plus! (it doesn't seem to affect either
problem), although I don't appear to have so many problems with the network
as I see other people around here having. I guess I needed a replacement
bug. xD