Why do I always get this spam on MSN messenger and how do I stop it?

[DaRuSsIaMaN]

[15:05][email protected]: Hey DaRuSsIaMaN .....I cant upload my pics to msn for some reason!
Hit me back up on link removed
My screen name is WANK4ME you can find me there.

I intermittently receive this message on my MSN messenger as long as I stay logged on, from different @hotmail accounts. While it can be rather funny, I've had enough for now. How do I prevent this spam from reaching me? And why does it happen in the first place? I asked my friend on msn messenger if he gets this, and he says he does not.

Thanks.

 

[Net Jockey]

Merry Christmas to you.

 

[Sniper]

I had something similar couple of years back, just ignore the messages and they should stop.

 

[DaRuSsIaMaN]

Oh. Hmm. I'm not very optimistic lol. How do they even find screennames to target? I, for instance, can't see how I can send an IM to some random person on msn, unless this person told me s/n first... so how do they know mine? Any ideas?
Thanks.

 

[RHochstenbach]

Have you already scanned your computer for viruses with an up-to-date malware scanner?

 

[DaRuSsIaMaN]

I use avast and spybot. Yes, did scans, nothing.

 

[RHochstenbach]

Have you also tried logging on with that account using a different computer?