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How does Windows XP activation work?

Friday, 26 October, 2001

Can you tell us more about Windows XP registration. You briefly touched on it in the November 2001 edition of PC User. Please explain exactly the registration procedure.

Tony , ,


The first thing I have to warn you about Tony, is that you're using inflammatory language there. If you persist in using the term registration, Microsoft might have to send the boys around to convince you not to.



Microsoft calls it activation, which is a polite way of saying that the product won't work unless you do it. (Registration is where you tell the vendor that you're the one who bought a particular product -- usually handing over some personal information in the process.)

    1) When you install Windows XP (from a retail box version) it will ask you to input the product key, as normal. Then it tells you that the product will only keep working if you "activate" it. You have 30 days to activate, then it stops working.

    2) Activation is normally done via your Internet connection, or if you prefer, by 24x7 telephone. Microsoft swears that no personal data is transferred in this process -- especially your name.

    3) The process of activation takes the product key and a number of facts about your system, and turns them into a unique number that's registered with Microsoft, which in turn issues an activation code that is placed in Windows on your PC.

    4) Windows routinely checks this code against the system (presumably as it's booting) and if it sees a significant difference in the hardware, it assumes that it's been installed on another PC, so it refuses to boot, and tells you to reactivate the product. That means that legitimate users will be inconvenienced by having to re-activate sometimes. We don't know what changes will trigger this -- we'll just have to wait and see.

    5) There's no point using the activation code on another installation as the system profile will be different, so it won't work.

    6) If you try to activate the product on more than one PC (get more than one activation key) Microsoft will refuse to do it. If you have a legitimate reason, such as moving it from one machine to another, they will allow it, and give you a new code.

    7) The activation process is there for one reason only -- Microsoft realises that there are more pirate installations of its software than legitimate ones. It wants that money, thank you very much!

We'll update this answer as we learn more about the activation process. Anyone got an interesting experience to share?


Microsoft has quite a bit of information about activation on its web site, such as these:
About Microsoft Product Activation
Answers to Questions About Microsoft Product Activation
About Microsoft Product Activation and Microsoft’s Volume Licensing Customers
Microsoft Office XP Product Activation


Here's what Microsoft says specifically about Windows XP activation:


Microsoft is committed to the protection of intellectual property rights and the reduction of software piracy. Everyone in the economic chain—not just the software manufacturer—is hurt by piracy, including the reseller, the support provider, and you, the end user. Authentic Microsoft software assures you of high-quality, virus-free software. Pirated software does not.

Windows XP retail products contain software-based product activation technology, which means you need to activate your copy of Windows XP in order to use it. Some new PCs purchased with Windows XP pre-installed will also require activation. If your organization licenses Windows XP through one of Microsoft’s volume licensing agreement programs such as Open License and Select License, you will not be required to activate those Windows XP licenses.

Product Activation Overview

Microsoft Product Activation is an anti-piracy technology designed to verify that software products have been legitimately licensed. This aims to reduce a form of piracy known as casual copying. Activation also helps protect against hard drive cloning. Activation is quick, simple, and unobtrusive, and it protects your privacy.

Product Activation works by verifying that a software program's product key has not been used on more personal computers than intended by the software's license. You must use the product key in order to install the software and then it is transformed into an installation ID number. You use an activation wizard to provide the installation ID number to Microsoft either through a secure transfer over the Internet, or by telephone. A confirmation ID is sent back to your machine to activate your product.

The installation ID number includes an encrypted form of the product ID and a hardware hash, or checksum. No personally identifying data is included or required. The confirmation ID is simply an unlocking code for the Windows XP installation on that particular PC.

If you overhaul your computer by replacing a substantial number of hardware components, it may appear to be a different PC. You may have to reactivate Windows XP. If this should occur, you can call the telephone number displayed on the activation screen to reactivate the software.

Activate Windows XP Right Away

If you have not activated Windows XP, you will be reminded each time you log in and at common intervals until the end of the activation grace period of 30 days. If you have not activated Windows XP within this timeframe, you will need to do so to continue using it.

If you choose to activate your product over the Internet, upon your submission the activation wizard will detect your Internet connection and connect to a secure server to transfer your installation ID to Microsoft. A confirmation ID is passed back to your computer, automatically activating Windows XP. This process normally takes just a few seconds to complete. No personally identifiable information is required to activate Windows XP.

To activate Windows XP over the telephone, you can simply call a toll-free* number displayed on your screen. A customer service representative will ask for the installation ID number displayed on the same screen, enter that number into a secure database, and return a confirmation ID to you. Once you have typed the confirmation ID, the activation process is complete.

Product Registration

Product activation is not the same as product registration. As discussed above, product activation is required and is completely anonymous. Product registration, on the other hand, is completely optional. You may opt to provide personal information, such as your e-mail address, for product registration purposes. Registration entitles you to receive information about product updates and special offers directly from Microsoft. All registration information provided is stored securely and no information is ever loaned or sold to third parties.

Product Activation Protects Your Privacy at Every Step

Activation data and any optional registration data provided to Microsoft is stored in a secure facility. Microsoft's privacy statement is displayed during the activation process.

* Toll-free telephone numbers are available in all countries whose telephony infrastructures provide for them. The telephone numbers to call are displayed when telephone activation is chosen.


Then there's the ever-popular

Windows Product Activation Demo
Learn more about how Windows Product Activation protects you from software piracy.

300k | 100k | 56k

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Paul Zucker



Reader solutions



brinePosted: 16/08/2010

re: How does Windows XP activation work?
how does active nation work?

(I don't know, What is it? -PZ)

Stratulat AlexanderPosted: 28/07/2010

re: How does Windows XP activation work?
Benutzkonto anmeldung geht nicht immer macht ein Blitz und geht raus.
JER0EN R0LANDPosted: 07/10/2009

re: How does Windows XP activation work?
The Product Activation is write into register *C:\Windows\config, C:\document and Settings\useraccount *.dat file and in the WPA file, and C:\Windows\Prefetch. There are diffirent version of Windows XP retail and OEM. But two file are very imported to identificate your Windows , dpcdll.dll and pidgen.dll
Mr. H@x0rPosted: 10/09/2009

re: How does Windows XP activation work?
Wxactly HOW does activation work? When you do the over the phone activation, and you give them the info and they give you the activation key, how EXACTLY do they do it? I mean what algorithm does Micrap$oft use to generate the activation key. I'll need this info for a little "project" I'm working on ;)

(You first need to do a frangle in the whoopsie. -PZ)

IT news and Technology updatePosted: 31/12/2008

re: How does Windows XP activation work?
Very nice tips and information..Thank you ver much for sharing this info
mad dogPosted: 17/06/2008

i hate microsoft
all i want too do is watch some movies on my old computer cos the new one broke and it keeps asking me for this bloody activation thing. I BOUGHT IT SO WHY CANT I USE THE DAM THING. Microsoft sux im buying an apple

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