How to Uninstall a Windows XP Theme
- 1). Open the Control Panel window by selecting "Control Panel" from the Start menu.
- 2). Scroll down the list until you find the icon labeled "Display". Click on this icon.
- 3). Select the "Themes" tab in the dialog box that pops up.
- 4). Scroll down until you find the theme you wish to delete.
- 5). Click the theme, then click the "delete" button. This will remove the theme from Windows XP.
Source...