from the MS web site http://www.microsoft.com/en-us/download/search.aspx?q=kb936929
Good luck.
I have recently inherited an old Dell computer from my in-laws. I have windows XP on my home computer and have purchased a Linksys E900 router and Vallet in order to add this old computer to a home network.
Now I cannot connect this computer to the internet/router without the Windows XP service pack update. I even tried to install a new operating system (Windows 7) but it can't do that either without the update to XP. I copied a Windows XP SP3 ISO file from the Windows website and tried to update the computer this way.
Now I cannot "mount" or "run" the ISO file. It has Roxio Creator but I can't figure out how to install the update with this program.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic