To uninstall World of Warcraft: Wrath of the Lich King:
Please keep in mind that you will lose any screenshots you have taken if you do not back them up from the Screenshots folder in the World of Warcraft directory. You do not have to worry about losing characters or account information this way. Your characters and all their information are stored on the World of Warcraft game servers. However, if you are planning on reformatting your hard drive, you should make sure to save your account name, password, and authentication key in a safe place.