OK so the latest scam is a bunch of indian guys phone you claiming to be calling from california. If you press them for address details, they're vague and give you a bogus street address. Their website is www.eprotectionz.com.
They start by telling you that they're helping all the windows users on earth to remove a virus. They take you through steps to find out whether you "have" the virus, which actually involves turning on your remote administration features and allowing them to remotely manage your machine. Thereafter they can do what they like; install viruses, spambots, keyloggers, etc., and get all your personal information.
Interestingly, if you tell them you have a mac or linux they go away.