Windows live dissapeared?

Hi, when I fired up my toshiba Satellite Pro (win xp pro) this morning, the windows live sign in box came up as normal, but after it logged in and showed how many emails etc the box dissapeared? and the icon in the task bar also went, I now don't get any notification when an email has been received, only be clicking on the "windows live" in the tool bar can I see if there are any new msg's.
I have carried out a restore to a date last week when everything was working normally, but I still get the same result? There has'nt been any new programs added or removed.