Here is a direct download to Windows XP SP3 offline install.
For your information, it is 316.4MB
Overview
Windows XP Service Pack 3
(SP3) includes all previously released
updates for the operating system. This
update also includes a small number of
new functionalities, which do not
significantly change customers’
experience with the operating system.
If you're updating just one computer,
please visit Windows Update at
http://update.microsoft.com.
Note:
Customers running Microsoft
Dynamics Retail Management System
(RMS) are advised to install a hotfix
for a Microsoft Dynamics RMS issue
prior to installing Windows XP SP3.
DO NOT CLICK DOWNLOAD IF YOU ARE
UPDATING JUST ONE COMPUTER:
A smaller,
more appropriate download is now
available on Windows Update. The best
way to ensure you get Windows XP
Service Pack 3 is by turning on the
Automatic Updates feature in Windows
XP. You can use our step-by-step
instructions or, if you prefer, let us
do it for you.
The Microsoft Download Center site is
your only authorized web source for
downloading a licensed copy of Windows
XP Service Pack 3. To report a website
offering unlicensed copies of Windows
XP SP3 for download, please send
e-mail to: piracy@microsoft.com or
visit
http://www.microsoft.com/piracy/ReportingUs.mspx.