SmileWorld

Your contacts list has been Hacked and they are using it to
send trash to your friends.you should tell them not to
open them as they may contain spyware.
You and your friends will need to do a full spyware scan
and then change the passwords when it is completed.
Make a note of your new Password.

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How to stop it happening again.
clear out your browser cache including history and all remembered
passwords and form data.
check your contact list for names/addresses that you don't know
and delete them,
Never leave your PC without signing out of the internet.
Always mark junk mail as Spam right away.
Always use the Bcc function,when sending the same email to all
friends.

It doesn't show all your address book.
Have a good day,and be safe.

This is a very common problem seen here on Answers several times daily. You or a contact of yours has been hacked, plain and simple. It's a bad worm/trojan, not a virus and it's on your computer.

You need to download and run a couple of reliable anti-malware programs, especially the most effective Malwarebytes Anti-Malware at http://www.malwarebytes.org/mbam.php
and/or Spybot Search and Destroy at http://www.pcworld.com/downloads/file/fi…
and/or Windows Defender at http://www.microsoft.com/windows/product…

Of course, a thorough scan with a couple of good anti-spyware programs in Safe Mode is an obvious suggestion. Hit F8 repeatedly when the screen first lights up, then choose Safe Mode, using the arrow keys and Enter to get there. Run each full scan in Safe Mode, re-booting into Safe Mode after each scan. Afterwards, delete all System Restore Points. Start > Accessories > System Tools > System Restore > delete (small print on left) Create a new System Restore Point after you re-boot into Normal Mode.

Carefully read the technical advice given below - they are the best, most-detailed I have ever read. Read them BEFORE you set up a new safe account! Contact everyone with your new address, including your name and 'new address' in the Subject line, as well as an apology to them. Urge ALL of them to use BCC: and delete all addresses when forwarding mail too! Warn them not to click ANY links or even open mail from the old address. (Some malware can infect computers just by opening the mail.)

Changing your password is NOT sufficient, even though that is Yahoo's advice! Use a very strong password (letters, capitals, punctuation, numbers, symbols - the longer the better.) Start with a sentence, and make substitutions. Be sure the result is one you can remember. Change your 'Secret' Questions and Answers too - ones that nobody could guess - Yahoo even allows you to invent your own questions. Change and add all-new alternate e-mail addresses too.

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Ashish