It won't install because it won't pop up when I first open Minecraft. You know that screens it pops up for about 10 seconds whenever you install FML? Mine for some reason won't do that, I am trying to install the NotEnoughItems Mod v1.4.5. And incase I'm doing this wrong, here is my installation process.
1. Download the latest Forge Loader
2. Open it up with WinRar
3. Drop all the class files into the minecraft.jar
4. Open Minecraft to see if it will work, and of course, it doesn't.
Edit: Also yes, i have deleted META-INF