Facebook users who added the "Secret Crush" application to their profile got a surprise recently when they found that instead of revealing who that secret someone might be, they received an invitation to visit a website and download adware files that would produce pop-up ads on their computers.

If you currently use LavaSoft's free version of their spyware detection software Ad-Aware SE Personal, you'll need to upgrade to their Ad-Aware 2007. This product also has a free version, and on the LavaSoft website there's a special offer in conjunction with TrialPay to get the Plus version, regularly $26.95, for free.

As reported by Brian Krebs in the Washington Post today, Ad-Aware 2007 no longer supports any Windows operating system before Windows 2000, and it also now runs as a background service, like a virus scanner.