Activation Problems with Windows XP if the hardware changes
Windows XP includes a feature called anti-piracy Windows Product Activation or more commonly the activation process. This is to prevent you from installing a copy of Windows XP already activated on another PC. This procedure provides that, after installing the operating system to run an online activation within 30 days.
Through this activation, Windows XP sends an encrypted file that is used to identify the key components in the system. These data are stored in Wpa.dnl, a file in the folder% System-Root% System32. In short, this file determines whether, in case of hardware changes, we need a new activation. If you need to reinstall Windows XP after you have already activated, you should create a copy of Wpa.dnl.
If the hardware has not changed appreciably over the initial activation can be restored Wpa.dnl and skip the activation process. The same boot Windows makes a backup of the file, called Wpa.bak very useful in case of problems due to hardware changes. In case Windows will not boot because the new hardware has triggered the activation code, you can use a remedy to restore the old hardware, start the computer in safe mode with networking and rename Wpa.bak as the Wpa.dbl . In this way the system is reactivated.
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