This vulnerability affects Windows 2000, Windows Server 2003 and Windows XP. It is highly recommended that users of these systems install the update as soon as possible. To download the critical update now, select your system from the list below:
For additional information about this vulnerability and the critical update, see the Microsoft Security Bulletin MS04-007.
For Windows NT 4.0 (Workstation, Server, and Terminal Server Edition) users who have installed security update MS03-041, this may be a required update. To verify if the affected file is installed, search for the file named Msasn1.dll or go to the Windows Update page (http://v4.windowsupdate.microsoft.com/en/default.asp) and scan for updates. If this file is present, this security update is required. The patch for computers running WindowsNT can be directly downloaded via the Microsoft web site.