Microsoft issued a critical security warning Tuesday that a malicious exploit is making the rounds and attacking vulnerabilities in Internet Explorer 7.
The risk is believed to be widespread, given that IE 7 is the latest version of Microsoft's browser and is bundled with XP service pack 3 and also Vista, said Dave Marcus, director of security research and communications for McAfee's Avert Labs.
The AZN Trojan, which has been making the rounds since the first week of December, has the potential of infecting users' system with a Trojan horse, or "downloaders" that can download other forms of malware onto a user's system.
Microsoft announced it will release a security patch Wednesday via its automatic update system to patch users computers.
The patch will be available after 1PM. You can still probably use IE7 as long as you don't do anything stupid like click on a link in a spam email. But I'm not taking the chance.