Luna is the name given to the default visual theme of Windows XP. If you are nostalgic for it, find out in this tutorial how to install it for Windows 7 for free. Also available in Silver (silver grey).
Like many of the visual themes offered on the web, it is necessary to patch your system (if not already) to be able to install them.
Download Luna, default visual theme of Windows XP
Download the 2 Luna themes (the default blue and silver grey — silver) and extract files.
Double click on the file titled install sysfiles x86.bat (or install sysfiles x64.bat for 64-bit systems).
Then right-click on your desktop and opt to Customise.
Click on the theme Luna (available with or without Aero) and admire the result.
To uninstall the theme, start by enabling another theme, then right-click on the theme to be deleted and click on Remove Theme.
And to fine-tune the whole, consult our tutorial to Return to the old design of the XP/Vista way taskbar in Windows Seven