If you haven’t done so already, check Windows Update and Microsoft Update for patches. They released an “Out of band” patch for Windows Server Services, and Windows Defender.
This affects all supported versions of Windows, although for Vista and Server 2008, it’s listed as “Important” where it’s “Critical” for Windows 2000, XP, and Server 2003.
On Vista, you’ll have to restart your computer to allow the updates to take effect. So make sure you’ve got anything important saved.
Have a great night.:)