Your Mac is no longer as safe as it was.
This article Eric Schmidt: Want Security? Get a Mac | PCWorld Business Center reports:
“Meanwhile, over the on the Mac, the MacDefender malware, which inspired the security update from Apple, has apparently mutated into Mac Guard, which doesn’t require a password to install. This could fool even users who are technically savvy and who have been taught that programs without a password prompt are limited in the potential damage they can do. Installation of the malware starts automatically once users visit certain Web pages if Safari is set to ‘open safe files after downloading.’”
Be sure to disable automatic file opening after a download.
