This was in order to address an issue so severe that it couldn't wait for Patch Tuesday, the monthly release of various security patches. I'll spare you a lot of the tech but it has to do with a recently discovered vulnerability in the LNK component of a Windows PC, the LNK is what creates shortcut icons on your desktop. The flaw was discovered last month and malicious hackers quickly began to reconfigure their malware to take advantage of what was essentially an unlocked door. The patch is for Windows 7 and Vista users. If you're running XP or Windows 2000, you are out of luck. 

Update: I used a bit too much of a blanket statement there. The patch works on Windows XP SP3, but not on Windows XP SP2 or Windows Server 2000.

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