0X800A0007 Windows Update Error is one of the few very common Windows XP Automatic Update errors.

There are few possible causes and solution to 0X800A0007 Windows Update Error.

1. Your Windows XP is using other languages beside English as the preferred language.

   Solution: Try switch back English as the preferred language for your Windows XP and run Windows XP Update again.

2. Your Windows XP system is having wrong date/time setting and does not match the latest date/time.

   Solution: Try keep your system date time up-to-date by refering to a online atomic clock server.

   A very handy tool would be atomic clock from WorldTimeServer.com.

3. Problems with SSL (Secure Socket Layer), a commonly-used protocol for managing the security of a message transmission over the Internet.
   
   1. Your Internet Explorer does not allow SSL. Solution:
   2. In Internet Explorer, go to menu “Tools” -> Internet Options -> Advanced
   3. Under Security, tick both “Use SSL 2.0″ and “Use SSL 3.0″.

Hopefully you can find the solution for 0X800A0007 Windows Update Error here and solve it by using the guide above.