There security update is for jpeg processing.if Your Computer Install Windows XP Blow SP2, You'd Better Update Update Your Software.you Will Get More Information:
https://www.microsoft.com/security/bulletins/200409_jpeg.mspx
Microsoft Summary:
The GDI security update for September 2004 addresses newly discovered issues in JPEG processing technology. This issue affects software that supports this image format, including some versions of Microsoft Windows, Microsoft Office, and Microsoft developer tools. If you have any of the listed software installed ON Your Computer, You Should Install The Related Update.
Depending on the software you are using, you may need to install multiple updates from multiple location.
Important Windows XP Service Pack 2 (SP2) IS Not Affected by this Issue. Windows XP SP2 Users Only NEED To Update Office (if installed).
SeveritySoftware AffectedUpdate Number
