so i havent been on MSN (windows live messenger) in around a year, but i now want to start using it again, so i clicked on it and it wont come up, my bother said i need to down load it again or what ever but i dont know how or what to do, im just helpless 13 year old girl lol, when i try and dowlaod it it says its a virus can someone link me to the correct webiste, and give me stp by step on how to get it back? thanks