Windows users, watch out: The Department of Homeland Security is advising you to delete QuickTime from your system, Network World reports. The problem is that Apple is no longer supporting Windows versions of the program, and antivirus vendor TrendMicro has found vulnerabilities that allow "attackers to execute arbitrary code on vulnerable installations" (here and here). Apple agrees it's best to delete QuickTime from Windows computers, but says it's still supporting Mac versions of the program. "DHS doesn't usually issue these alerts, so it's pretty serious when it does," says Network World. Here's how to delete the program from Windows. (More Windows stories.)