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Windows Product Activation (WPA)
on Windows XP
Version 3.2.2 — Last Updated August 22, 2009
Hold mouse here for list of most recent changes.
by Alex Nichol, MS-MVP

The Microsoft Windows Genuine Advantage (WGA) has long been a major annoyance for a number of people. Although it’s designed as an anti piracy measure, all too often WGA causes problems for legitimate users telling them their copy of Windows XP isn’t legal and they should go and buy a full copy to make their system a “genuine” one. Download Windows XP Activator SP1, SP2, SP3. Windows XP Activato r is: a useful activator to activate Windows XP Operating System either SP1, SP2 and SP3. The Install Net Framework 4 can be downloaded here. 2nd Run Activation.reg. Run Windows XP Activator Click Activate.

One new feature in Windows XP that has caused great concern is Windows Product Activation (WPA). There are a great many rumors, and much misinformation, from which you might be led to think that WPA is going to call Microsoft every day and say just what you are doing with your computer; that, if you make any changes at all to your computer hardware, the machine will be instantly disabled; and that WPA is a sneaky way for Microsoft to store personal information about you or your computer, or to begin charging you a monthly fee for your continued use of Windows XP. In fact, all of these rumors are false. WPA is a fairly easy-going check when Windows boots, confirming that it is still installed on the same computer as last time it checked. That’s all. But the rampant misinformation is understandable, because it is hard for the general consumer to find a simple yet comprehensive explanation of just what WPA is. This page tries to fill that gap by explaining WPA in a straightforward, detailed way — and to show that it will be a lot less trouble to most people than many have feared.

What’s the idea of WPA?

The Microsoft License for use of Windows has always been limited to allowing installation on only a single machine (and that excludes having the same copy installed on a laptop as well as a desktop machine: only MS Office is licensed for the combination). Microsoft believes that this has been subject to much casual abuse. WPA is a means of ensuring that a single copy is not installed on more than a single machine.

So, within the first 30 days after installing Windows XP, you must get the system ‘activated’ if you are to be able to go on using it. This involves the computer dialing in and giving some information about the hardware on which Windows is installed, receiving in return a release code which will be recorded on the system. More is said below about OEM copies provided preinstalled on a new computer

At subsequent boots, Windows checks to see that it is still running on hardware that it can recognise as being the same. If it does not match well enough, you will be unable to do more than backup files until you call Microsoft to explain — for example, that the old machine broke down and had to be rebuilt — and get a new release code.

What hardware gets checked?

The WPA system checks ten categories of hardware:

Display Adapter
SCSI Adapter
IDE Adapter (effectively the motherboard)
Network Adapter (NIC) and its MAC Address
RAM Amount Range (i.e., 0-64mb, 64-128mb, etc.)
Processor Type
Processor Serial Number
Hard Drive Device
Hard Drive Volume Serial Number (VSN)
CD-ROM / CD-RW / DVD-ROM

It then calculates and records a number based on the first device of each type that was found during setup, and stores this number on your hard drive. Initially, this is sent to Microsoft in an automatic dial-up, together with the Product ID number derived from the 25-character unique Product Key used in setting up Windows.

If Service Pack 1 has been installed, the entire Product Key is also transmitted: This can then be checked against a list of known pirated keys

The hardware is checked each time Windows boots, to ensure that it is still on the same machine. Also, if you subsequently perform a complete format and reinstall of Windows, Microsoft’s activation center will have to be contacted again because the information held on the machine itself (the number previously written to your hard drive) will have been wiped out by reformatting the hard drive. If your hardware is substantially the same, this will be done by an automated call without your needing to talk to anyone.

What does ‘substantially the same’ mean? WPA asks for ‘votes’ from each of these ten categories: ‘Is the same device still around, or has there never been one?’ Seven Yes votes means all is well — and a NIC, present originally and not changed, counts for three yes votes! Minor cards, like sound cards, don’t come into the mix at all. If you keep the motherboard, with the same amount of RAM and processor, and an always present cheap NIC (available for $10 or less), you can change everything else as much as you like.

If you change the device in any category, you have lost that Yes vote — but will not lose it any more thereafter if you make changes in that category again. So, for example, you can install a new video display card every month for as long as you like.

Note that it appears that if you boot with a device disabled (disabled — not removed), the device is not found in the enumeration — so if, say, you disable a networkconnection which uses the NIC and then reboot, you may be missing its three votes and find that a new activation is needed. If you are doing suchthings, take the Hint 3 in What about formatting a hard disk? below, and restore the files concerned once the NIC is back in service.

What if I make too many changes?

If, on Windows startup, there are not the required seven Yes votes, the system will, in the original version of Windows XP, only boot to Safe Mode. You will be required to reactivate by a phone call to Microsoft. You will have to write down a 50-digit number, call into the activation center on a toll-free number that will be given to you, read and check back the number you recorded — and explain the circumstances. In exchange, you will be given a 42-digit number to type in. This will reactivate your copy of Windows.

This is made easier if Windows XP Service Pack 1 has been installed: The system will continue to boot normally for three days, during which time you will be able to contact the activation center via the net. If the extra changes have been removed, or if 120 days have passed since the original activation, you will be able to use the automatic process once more

What about formatting a hard disk?

Two things are recorded for disks: the number of the disk drive itself, and the Volume Serial Number (VSN) of the partition on it.

HINT No. 1: The VSN is part of the data in the partition’s first sector, so it is changed when you reformat the drive. It is worth getting the freeware utility Volume ID to restore the original VSN. Before you reformat, run VOL from a Command Prompt, note the VSN (e.g., 1F2E-3C4B) in the second line. Then, after the reformat and new Windows XP installation, defer the new activation until you have run Volume ID to restore the old VSN, and rebooted. This is not essential — but it saves one of the ‘Yes votes’ against any future hardware change. (If you don’t wish to run this utility, the next best way to obtain the same result would be to delete the old Win XP files from the hard drive before reinstalling, rather than actually reformatting.)

HINT No. 2: Another thing that changes the VSN is converting a FAT 32 partition to NTFS. So, if you upgrade a system using FAT 32 to Windows XP and intend to convert to NTFS, do the conversion before activating the system. Remember, you can wait a while: you have 30 days before you need to activate. The machine’s hardware at the time of the first activation is what counts. Or, if you have already activated, use Volume ID as described in Hint No. 1. If you are doing this after activation, also first back