For @Zimmerframe only regarding Windows XP SP3 on your computer only, and only and where your keyboard and mouse still work after this awful Microsoft Update.
First ensure that you have a backup of the data on your computer. No two Microsoft Windows computers are the same.
Go to "Add/Remove Programs" and remove KB2862330 but if you are offered interlocking updates do not select "reboot now" but remove each interlocking update in turn until you finally click on "reboot now". Write down each update which you remove on a piece
of paper (do not rely on a Microsoft Windows computer for this taxing task).
After the reboot, go to "Windows Update" and "Check for Updates" and then Hide every update which you removed. One more reboot and you should have control of your computer.
Keep monitoring the KB2862330 threads in the event that Microsoft eventually release a fix for this worldwide "catastrophe". I got that emotive word from our friends in France:
http://answers.microsoft.com/fr-fr/windows/forum/windows_7-windows_update/maj-kb2862330/5d268111-f272-4588-b4b6-bd82c14db33b
I could have quoted similar emotive word from virtually every Country on the planet.