MY MSN IS SCREWED!!!

Bah!!! It is selective what message I can send out and what message I can receive.
It disconnects me when I'm in the midst of chatting.
I can't reconnect after that.
If I can, the whole world appears offline thought i'm so sure there are people online.
Screwed!

HELP!!! Any way to cure it??? Or maybe it is my freaking internet connection... Fwah!!! It disconnects halfway when I'm using... Like weak signal. I got this nagging feeling that someone may be tapping it... But i dunno how to set password... My cable is not tt fast kaez.. plus it supports 2 desktops... and 1 laptop... and one of the desktop is like perpatually online playing DOTA or sth... (eh.. it's a game). Help!!!