Is there a Service Pack for Windows XP?
What is Windows XP Service Pack 3 (SP3)?
Can you still download Windows XP SP3?

About Windows XP Service Pack 3
Is there a Service Pack 3 forWindows XP?
Below is how to get this package for your XP OS.
If you want a Windows XP SP3 ISO, get it from https://archive.org/details/WinXPProSP3x86.
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This ISO is related to Windows XP Professional SP3 x86.
Virtual Machine is very important for doing some tests.
How to setup a Virtual Machine?

This post shows you the step-by-step guide.
Given the high system requirements, purchasing a new PC may be necessary.
ForPC backup, run MiniTool ShadowMaker, one of thebest backup software.
If needed, get this package as per the guide.
Besides, upgrade to Windows 10/11 as soon as possible.