Restoring the XP activation status information after a reformat of your system.

Click here to read the full story >> Follow the below steps.

1 Click open 'My Computer', then C drive (Or the drive in which you installed windows)
2 Navigate to the C:\Windows\System32 folder.
3 Locate the files named "wpa.dbl" and "wpa.bak" and copy them to a safe location such as a USB key or CD or another drive.
4 Reformat your disk and reinstall Windows XP on your reformatted hard drive, click "No" when asked if you want to activate Windows.
5 Reboot your computer into SafeMode (press F8 as Windows is booting up to see the Windows Advanced Options menu and select SAFEBOOT_OPTION=Minimal)
6 Open 'My Computer', then C drive again.
7 Navigate to the C:\Windows\System32 folder again.
8 Locate the files named "wpa.dbl" and "wpa.bak" (if it exists) and rename them to "wpadbl.new" and "wpabak.new"
9 Copy your original "wpa.dbl" and "wpa.bak" files from your USB key, CD or DVD or other location into the C:\Windows\System32 folder
10 Restart your system.

Wasn't this simple.