If so, and you're not certain your computer is fully patched as of this morning's new Microsoft admissions of guilt, please choose "Windows Update" from your Start menu right now, or visit http://windowsupdate.microsoft.com/ using IE 4 or higher.
Also, please make sure you have current antivirus software installed, and have updated your virus definitions today. Can't afford the commercial software? http://www.sarc.com/ has links to free online virus and security checking tools and removal tools.
The staggering number of Windows users with inadequately patched/protected machines is making the Internet incredibly unpleasant this week for the rest of us.