Невозможно деактивировать windows xp, изменив лицензию в реестре

This may be a little bit too obvious but the official Microsoft Support article has two possible methods for changing the product key. The first one is certainly the one you've already tried, but there is also a second method using a VBScript.

If you copy and paste the VBScript given in microsoft article http://support.microsoft.com/kb/328874 into a text editor like notepad, and then save the file with a .vbs extension (use quotation marks around the file name if you find that the .txt extension is automatically appended).

Then execute that script with the new product key as an argument as shown in the instructions given beneath the script. Obviously if you have noted saved it to the root of your C:\ drive the exact command you'll need to type into the run dialog will include the location where you have saved it. Alternatively you can run this from the command prompt in the same way.

I can't think of any good reason for doing what you are trying to do - if you are trying to change versions - you need to reinstall anyway... and, if you have OEM - it dies with the machine and cannot be moved - if however you have fully packaged product, and you need this one for another machine - then why can't you simply apply to the other machine the one you were going to change this machine to?

Anyway....

Windows doesn't have a way to "deactivate" (not talking KMS/advanced stuff here), you are simply corrupting the license and applying a new one.

As annoying as activation is, it isn't about annoying end/home users who have the correct amount - it is about stopping piracy on a large scale.

You should always try the right thing, but, if activation fails and you have the correct intentions/correct amount of licenses/similar, you have done your best (well, hope someone else can give you an answer, but if they don't - read on!)

I previously had a problem with Windows Server licenses when I needed to change from a MSDN key to partner key (due to usage restrictions), I couldn't easily change and I was simply told by Microsoft that as long as they are all activated without issue, and I remember what is what, they quite frankly don't care and have bigger issues... just don't take advantage.

e.g. if I have 5 MSDN keys (development only) and 3 partner keys(for internal usage) - they wouldn't don't really care if you re-purpose a development one to internal use, as long as you don't go over 3 internal use and don't take advantage of them.

• Идти к windows\system32\
• Переименовать WPA.DBLиWPA.BAK
• Запустить снова

Вам будет предложено активировать окна с новым ключом.