A PC virus has started to spread through e-mail, luring potential victims by disguising itself as a headline newsletter from CNN, an antivirus company said Thursday. E-mails laden with the virus, dubbed "Crowt.A" by Sophos, do not have a typical subject line and other characteristics, Sophos said. Instead, the virus sends out e-mail messages with subject lines, message content and attachment names drawn from the latest news headlines on CNN's Web site, which it gathers as it spreads. Very few Sophos customers have reported that they been affected by Crowt.A so far, the company said. "Virus writers are always looking...