Hacked?

Hello,
hi everytime i sign into windows live(msn) my friends say that they have been sent a website link that is rude. This is as soon as i sign in. I didnt even talk to anyone and they say that they still get it.
Ive tried resetting my password several times(8 times i think...) and still my friends on my contact list still say that they getting the link. I tried reinstalling msn but that hasn't helped.

Can anyone help me???

Thanks...