How to install the Zombie Subway Mod in COD WaW

First get the mod here but dont extract until you read the rest of this.
Then make sure you have a folder named mods in:

Windows XP

--- C:\Documents and Settings\YOUR_PROFILE\Local Settings\Application Data\Activision\CoDWaW

Windows Vista

--- C:\Users\YOUR_PROFILE\AppData\Local\Activision\CoDWaW
Important!!! this may be a hidden folder and can be hard to find!

(If you don't have the mods folder, then go to your CoDWaW folder by following the location shown above and create it so that you will have the proper place to extract the files to.)

Unzip the Nazi_Zombie_Subway file to:

Windows XP

--- C:\Documents and Settings\YOUR_PROFILE\Local Settings\Application Data\Activision\CoDWaW\mods

Windows Vista

--- C:\Users\YOUR_PROFILE\AppData\Local\Activision\CoDWaW\mods
Then start your game and run the mod (you have to select it in your mods list in-game BEFORE running single or co-op mode)

To run in solo mode, launch the mod, then resume a mission in progress (don't worry, this won't overwrite your saved mission progress) or you can start a new mission but you will lose your progress.
After the mission starts bring up the console by hitting the tilde (~) key and enter this-
/map nazi_zombie_subway   (Don't forget to hit enter)
Now, turn down the lights and have fun!