How about this for a catch 22...we need an update to fix a "not able to update" issue...Thanks Microsoft!
See if you can download this one....it's not from the update site.
Create a folder on the desktop (Right click the desktop, choose "New" and then "Folder"...Name it SP2)
Go HERE and download Service Pack 2 for Windows XP...choose the option to "Save" in the "File Download" dialog box...Save it to the folder you created on the desktop (SP2) by navigating to it in the "Save In" text box...click "Save"
This is a very large download and will take quite a while...Let me know if you can download it...