1 step
enter %appdata%
2 step
enter .minecraft
3 step
delete minecraft.jar
4 step
open your minecraft
5 step
force update
6 step
mod your minecraft
7 step
open minecraft
8 step
Have Fun O.o

The problem may be the mod is a different version of minecraft then your jar is, so either download a older .jar or wait for the mod developer to update it.

still didnt work

sed11Don't install ModLoader and then Forge/.
You only need one or the other, Forge or ModLoader.

If it needs ModLoader, you may as well install Forge so you can also install Forge mods. (Unless it overwrites an important Forge class)

If it needs Forge, you have to install Forge for it to work. (And do not install ModLoader along with Forge)

Also make sure the mod matches your Minecraft version.

hi there! i tried these steps but got the same result

DasDurieldelete the minecaft.jar
force update
reinstall all mods in the right order and dont forget the meta-inf

many mods "can" break the update funktion of minecraft

Don't install ModLoader and then Forge/.
You only need one or the other, Forge or ModLoader.

If it needs ModLoader, you may as well install Forge so you can also install Forge mods. (Unless it overwrites an important Forge class)

If it needs Forge, you have to install Forge for it to work. (And do not install ModLoader along with Forge)

Also make sure the mod matches your Minecraft version.

Hi guys, i forgot to mension that I DO NOT HAVE A MAC!

It may be installed incorrect if you use a mac.http://www.youtube.com/watch?v=ehDJ0WSmPUE

delete the minecaft.jar
force update
reinstall all mods in the right order and dont forget the meta-inf

many mods "can" break the update funktion of minecraft

Are you using a mac?