As most of the user of msn messenger know that, there's always some of your friends will send you a link see who's blocking you and so on..and when you click on the link they request you to enter your msn account, after that your friend always will keep asking what is the link that you sent while you never send anything to him/her...
Is that a virus? actually not ,because you provide your password and user to the website ..so there's some guy out there using your acocunt to send those unwanted html link to your friend and make them the next victim of spamming...what you need to do is change the password of your MSN account and keep your password secret ..
Help to spread it =)..maybe your friend is annoyed with the spamming of unwanted link into the conversation box.