I posted it here in Cnet also. See http://reviews.cnet.com/5208-6132-0.html?forumID=32&threadID=39808&messageID=467147
The download update page was revised by Microsoft after I posted it.
Earlier the only Operating System supported is Windows XP Embedded. Afterwards, the supported Operating System has been changed to support Windows XP, Windows XP Home Edition , Windows XP Media Center Edition, Windows XP Professional Edition , Windows XP Service Pack 1, Windows XP Service Pack 2
You only need the update if you are seeing "Stop: c0000135" and "winsrv was not found" error message after you install Windows XP Service Pack 2
If you don't see that error message, you don't need to install KB885523
See also the response by Grif http://reviews.cnet.com/5208-6132-0.html?forumID=32&threadID=39808&messageID=467578
Donna, I saw your post on KB885523 windows update so I downloaded and installed it. What I don't understand is why Windows Automatic Update didn't do it. Also I ran a manual windows update and it didn't show an update as being available. How come??? Thanks Auggie