Windows 7: windows live messenger(offline)

hi guys i am new to this section.anyway i am having alot of problems first one is windows live messenger it shows window opens but when i sign automatically i am seeing windows live messenger (offline) right next to it it shows like this windows live messenger(offline) i cant get it to show online, i cant sign in at all. second one is when i go to internet explorer to go to msn homepage..i get a message saying http 404 not found.then i also get there is a problem with the websites security certificate for msn there is something going on here i am also getting when i open a page small white box window open says MTxr could not create file mapping object (5) also thats creating a problem for me what do i need to do to clear this up and to get windows live messenger(offline) fixed to be online not showing offline... then how do i fix the other things as well i am trying to get online asap

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What version is your messenger client?

What operating system are you running on?

i have windows live messenger version 2009 (build 14.0.8117.416 i am running windows 7 home premium x64 bit