For Messenger, you can turn off autostart. Good thing, my startup is cleaner. Bad thing, I usually forgot to turn it on LOL. And worse, I set it to Appears As Offline, hahah. The Win7 big messenger status does help though.
This is why I hate those pre-installed computers, tons of crapwares. My computer is clean and backup at cleanest state. And my number one rule, never install anti-virus, the worst resource hungry junk ever. You know the funny thing is when you get virus, you get one, not even anti-virus can save you, especially when suscription is expired. And usually user will get careless when they think they are protected.