Click on Start and then Run.
2.
In the text box in the Run window, type regedit and click OK. This will open the Registry Editor program.
3.
Locate the HKEY_LOCAL_MACHINE folder under My Computer and click on the (+) sign next the folder name to expand the folder.
4.
Continue to expand folders until you reach the HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\Current Version\WPAEvents registry key.
5.
Click on the WPAEvents folder.
6.
In the results that appear in the window on the right, locate OOBETimer.
7.
Right-click on the OOBETimer entry and choose Modify from the resulting menu.
8.
Change at least one digit in the Value data text box and click OK. This will deactivate Windows XP.
9.
Click on Start and then Run.
10.
In the text box in the Run window, type the following command and click OK.
%systemroot%\system32\oobe\msoobe.exe /a
11.
When the Windows Product Activation window appears, choose Yes, I want to telephone a customer service representative to activate Windows and then click Next.
12.
Click Change Product Key.
13.
Type your new, valid Windows XP product key in the New key text boxes and then click Update.
14.
If you're taken back to the previous screen and prompted, choose Remind me later.
15.
Restart your PC.
各位對於大量授權版有誤會呀..講完可能大家更覺得微軟撈的兇
所謂的大量授權(VOL) ..OPEN , SELECT 等方式，基本上在你的機器上還是要有OEM版
在微軟的授權合約是非常清楚的...他叫"UPG" ..upgrade ...upgrade什麼東西呢...
他是upgrade你機器上得OEM版 ...
like 你機器上是Win2K , WinXP , Vista等....你就需要去買大量授權去upgrade到 Win7 or Vista
大量授權本身是有很多benefit的，不是單純只是序號的不同..
例如大量授權，可以降級...例如你現在買的Windows Desktop UPG的最高版本是到Vista
但是你可以任意使用Win2K , WinXP , Vista等版本，只要總數不要超過你買的授權數量即可
當然，大量授權還有提供其他像 MODP等其他好處 ..不過那個就很少人知道了.
簡而言之，微軟的授權方式超級複雜..
BTW，就開版大的需求，他們應該買的是GGWA
摘錄自Microsoft網站
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大量授權的 Windows 作業系統只提供升級版， 不能夠單獨銷售，必須跟隨已經購買『隨機版』或『彩盒包裝零售版』的電腦來進行採購。其他包含 Windows Server 及 Office 等應用軟體及伺服器軟體等無此限制。
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呸呸呸..... 我多嘴了!
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