You can download XP updates as program files, save them on your hard drive, reload them when you need to, and even share them between computers.
first Get a XP cd
You'll find other Windows XP updates at Microsoft Windows Update. The site requires Internet Explorer 5 or later; so forget about using Firefox, Opera, or any other alternative browser. If the page generates an error message telling you that you must have an administrator account--even if you are logged on as an administrator--look at the top of the browser window for a message asking permission to install an ActiveX control. You need to grant permission to download the control before you can proceed.
When you get to the catalog page, click Find updates for Microsoft Windows operating systems. Choose Windows XP SP2, and then click Search, Critical Updates and Service Packs.
This will display a list of updates. Click the Add button under the relevant ones to place them in your download basket
When you're done, click Go to Download Basket, enter or select a download location, and click Download Now.
Save them to a flash drive, bring them home and install on your pc.