Thank you for posting in Microsoft Community!
I understand that you are facing issues with Windows Update.
Windows Update error: 0x8024400A may be caused by any of the following issues:
•Programs or processes that interfere with Internet communications.
•Resource issues on the computer.
•High Internet activity.
•Recoverable database errors.
•Corruption of Windows updates Component.
•Incorrect Windows Update data locations.
•Interference of Antivirus and firewall.
Note: When you say "download" I believe you are referring to installing the update. Let us know if I have understood you wrong.
With which update are you facing issues with? What is the update KB number?
To check the history of list of failed Windows update, follow the steps below:
a) Click Start, click All Programs, and then click Windows Update or Microsoft Update.
b) Click Review your update history. A window opens that shows all the updates that are installed and those that did not install successfully on the computer.
Is the issue confined to an update?
Have you made any changes to the computer prior to the issue?
Which edition of Windows XP are you working with? Which service pack is installed on the computer?
What is the complete error message received?
Let's try the following steps and check if it fixes the issue:
You need to run the fixit from the article mentioned below –
Note: Make sure you Turn on the Firewall and re-enable the antivirus after performing all the troubleshooting steps since the computer will be at a risk of virus infection.
Note: Important this section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow
these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the
article in the Microsoft Knowledge Base: http://support.microsoft.com/kb/322756- How to back up Registry.
You need to perform the steps from the article mentioned below-
Please ignore Method 7 from the following article.
...and then run the downloaded program to install SP2. You can ignore the text that says that it is for network installations and also ignore the text advising Windows/Microsoft Update if only updating one PC.
As an alternative to SP2 you could download SP1A (xpsp1a_en_x86.exe) from…