Somebody has hijacked my Yahoo email address and is using it to send x-rated emails . How do i stop it?

Somebody has hijacked my Yahoo email address %26amp; is using it to send x-rated emails using my address. How do I stop this? How do I contact Yahoo for help? I hope they they did not steal my address book. PLEASE HELP

Somebody has hijacked my Yahoo email address and is using it to send x-rated emails . How do i stop it?
I asked a similar question recently. What helped was doing a full system scan with anti-virus/anti-spyware programme.


The problem hasn't come up since so I imagine regular scanning and keeping the software up to date has solved the problem.