Yahoo hacker

Hi there, love the site, have a question for anyone willin to help. My yahoo messenger is sending me mass generated messages at like 50 messages a minute. when i sign on messenger, after awile, i get the message Crypt_weed1001 has added me to buddy list, an crypt_weed1002,1003,1004..on an on..so no matter how many times i block the jerk, he keeps coming back. Also sends a message "say bye bye to ur hard drive"
Now,..I have =only buddies on my list may contact me, ignore all other users, and he or program is blocked . i usually block like 50 didgets at end on his name for a lil peace in advance.
Question is: Any one ever heard of this happening?, any clue what to do? and any program that could possibly identify the ip addy or info of sender?(keep in mind only comes through messenger)
~~~well, thanks guys for any help you might have~~~will check in later
Pink

 

thanks

thank you for the help-will try this an see if it helps-pink