XP to XP Embedded

To start with, this is a bad idea.
You really need to get off of Windows XP (where the "XP" now stands for "eXPired").

There are better Operating System(s) out there now, even those that are free.
Example: Linux Mint - http://www.linuxmint.com/

But if you have to run XP, then at least initiate this 'hack' to maybe, possibly, get a few more updates from MS that might work with XP. Of course it comes with the standard disclaimer from Microsoft:

The security updates that could be installed are intended for Windows Embedded and Windows Server 2003 customers and do not fully protect Windows XP customers. Windows XP customers also run a significant risk of functionality issues with their machines if they install these updates, as they are not tested against Windows XP. The best way for Windows XP customers to protect their systems is to upgrade to a more modern operating system, like Windows 7 or Windows 8.1.

So here's how you do it:
[1] Create a text file on the desktop.
[2] Make sure you can see the .txt extension. If you can't, refer to here on how to turn it on.
[3] Open the TXT document, and Copy the following into it:
Windows Registry Editor Version 5.00 
[HKEY_LOCAL_MACHINE\SYSTEM\WPA\PosReady] 
"Installed"=dword:00000001

[4] Close and Save the TXT.

[5] With the TXT highlighted on your desktop, press [F2] to rename it to "embed.reg"

[6] Confirm you want to rename the TXT file to a REG file.

[7] Run the file and merge the setting with your registry.

[8] You're done! Go run Windows Updates now.