Virus warnings must be confirmed, all others will be closed until confirmed.
Warnings will not come in an email with instructions to notify everyone in your address book. That is the first indication that the warning is a hoax.
Here are links that will allow you to research virus hoaxes and Internet hoaxes of all types:
hoax-slayer - Snopes - Urban Legends - www.truthorfiction.com
Downloads - Adaware - Spybot - S&D - Free Virus Scan - Housecall - Free Anti-Virus - avast - AVG Free Computer Assistance - CyberTechHelp - Free Photo Hosting - Tow.Photos