Itunes can't work because of old bonjour??

i don't know why my itunes can't work
sometimes it can, sometimes it can't
i keep install and uninstall itunes almost everyday
i tried to uninstall itunes before i install the new one, but i can't get rid of Bonjour. i remove all the programs and files as the Apple's instructions, but i can't remove the Bonjour folder.
"mdnsNSP.dll" is the only thing left
i tried to delete "mdnsNSP.dll", but everytime it says that "mdnsNSP.dll" is being used. then i opened the Task Manager, i can't find the name. so i can't either end the process or delete it.
(i wonder if there's something wrong with my computer. virus?)
*please help me !!! i need music=(*

http://docs.info.apple.com/article.html?artnum=304424

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