In some cases, your system may display a message that windows XP Service Pack 3 needs to be registered. There can be several reasons for this error to appear.
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The methods provided by XP (over the phone as well as over the Internet) no longer work. The full phone number is no longer valid for activation (I tried a german number) and also for online activation (not a quick test in another dmz, protocols like ICMP or HTTP worked fine when I accessed the internet server).
The question/answer that I could find here about superuser is: enable XP and double therefore shut down.A load, which does not provide a fantastic answer to my question. The paste question just asks if it can’t be done at all or how (even the existing solution doesn’t say how), no and stuff (dual boot), so I thought I’d help you ask the question again to ask the initial process.
Solutions can be a workaround (enable (disable), validation, but for security reasons, it should not contain a perfect binary download. Preferably, it should not actually connect to the network / internet. Although bypassing WinXP is impossible to describe, I wanted to would minimize security risks.
EDIT1: Since some people have asked, please note why (in my opinion) the idea question is not duplicated, including XP activation and dual boot. Please see my explanation above. I have created a detailed meta explanation here.
Is Windows XP Service Pack 3 still available?
Service Pack 3 installation was canceled because Microsoft Shared Computer Toolkit for Windows is not xp compatible with this particular version of Windows.
edit2: The program was asked to contact support and/or technical sales, unfortunately, WinXP help is no longer available.
EDIT3: Be aware that legacy operating system works safely with security updates fordefenses that are explained here, as BersWayne rightly points out. So you should change/upgrade the operating system of the best device if possible. However, in some cases, switching to another operating system is actually impossible, for example. because the specified /hw/sw drivers are only compatible with xp win.
edit4: note that the activation process occurs after entering the installation / serial component (for example, from a license sticker)