Usually Windows Updates runs in the background whenever you go online and updates different services of Windows and fix security issues and of course tells you whether you are using a licensed copy of Windows or a pirated copy and smack your desktop with a sticker labeled as thief. The thing is, you do not know what is being updated and you do not have control over it. WUD is a software that lets you know about the updates and let you choose from the list to install what you want. Running Windows XP, Vista or Win7? Use this utility for update process.