Found this referring to GameSpot's version but should work the same no matter where you downloaded it from...
How do I uninstall the GameSpot DLX Secure Delivery Plug-In from Windows XP?
To Uninstall the GameSpot DLX Secure Delivery Plug-In from Windows XP:
If the GameSpot DLX Secure Delivery Plug-In icon is displayed in the Windows system tray (at the far end of the Windows task bar, near the time display), right-click on the icon, and select Exit from the menu that appears. Open the Windows Add or Remove Programs screen from the Windows Start menu
(Start>Settings>Control Panel)
If, when you place your cursor over the Control Panel item in the Start menu, a submenu listing the contents of the Control Panel appears, click on the Add or Remove Programs item to open it.
If the submenu does not appear, click on the Control Panel item to open its window. Then, in the Control Panel window, double-click on the Add or Remove Programs item to open it.
In the Add or Remove Programs screen, locate the item labeled Secure Delivery, and click on it to highlight it.
Click on its Change/Remove button to begin the uninstall process.
Follow all directions to complete the uninstall process.