Verifying XP Installation Has Been Activated
Many computers come with Original Equipment Manufacturer (OEM) versions of XP where the manufacturer has altered or totally removed options from the original menus. If the option Activate Windows in Method I isn't available the same results can be obtained using Method II
Method I
Navigate through Start > All Programs > Accessories > System Tools and click Activate Windows. A window will open that displays the activation status of the XP installation.
Method II
Click Start > Run and type [oobe/msoobe /a] (minus the brackets) in the Open: line. A window will open that displays the activation status of the XP installation.

- SRIKANTH DHANWADA