Time to update to SP2. Anew flaw has been found, and this time it affect a lot of Windows software, because it's about JPEG processing.
Or is it a subtle way to push users updating their XP :-)
" 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 locations.
Important Windows XP Service Pack 2 (SP2) is not affected by this issue. Windows XP SP2 users only need to update Office (if installed). "
Read more here (the page contains also a tool to test which software are at risk on your machine.