[quote=[SIZE=2]ui.worldofwar.net/][/SIZE]
Clean Installation (Basic Users):
Use this method if you are new to mods and do not understand how mods work in World of Warcraft, this is the recommended procedure.
1. Exit the game
2. Delete all the contents of your ..\World of Warcraft\Interface\ folder
3. Make a Backup of your ..\World of Warcraft\WTF\ folder, you only need to do this if you want to have a backup of data from mods previously installed, for example Gatherer, Map Notes, etc.
4. Delete your ..\World of Warcraft\WTF\ folder
5. Delete your ..\World of Warcraft\Cache\WDB\ folder
6. Launch the game without any mods installed and log into the game with one of your characters
7. Exit the game
8. Extract all the files from the compilation Zip file making sure to use folder names and point to your root World of Warcraft folder.
9. Launch the game
Removing UI/Mods
Removing an addon is as simple as adding them. Just delete the addon directory within directory.
c:\World of Warcraft\Interface\Addons\
For example...
c:\World of Warcraft\Interface\Addons\Delete me mod.
Originally Posted by http://www.wowinterface.com/forums/faq.php?faq=install#faq_howto_install