Microsoft has released another Knowledge Based (KB 154529) article.  This Fix it enables the NUM LOCK key for the logon scree. This is only applies to Windows XP, Windows 2000.

The status of the NUM LOCK key is specific for each user, and NUM LOCK is disabled by default. If you want the NUM LOCK key enabled for use before a user presses CTRL+ALT+DEL to log on, you must use Registry Editor to change the default behavior.

To enable NUM LOCK before a user logs on, follow these steps:

1. Run Registry Editor.
2. Move to HKEY_USERS\.Default\Control Panel\Keyboard.
3. Change the value for InitialKeyboardIndicators from 0 to 2.

To fix this problem automatically, click the Fix this problem link. Next, click Run in the File Download dialog box, and then follow the steps in this wizard.

Fix this problem | Download

Microsoft has just released exFAT file system support for Windows XP which was available only for Windows vista SP1 or later only.

Its an installation file which you can download via following link.

Download | WindowsXP-KB955704-x86-ENU.exe

After you install this item, you may have to restart your computer.