I've tried every version for 1.6.2 so far, but every time I instal it and start to launch it, it just doesn't work. Close to the bottom, this shows up:

file:/C:/Users/Gray%20Family/AppData/Roaming/.minecraft/versions/Modded1.6.2/Modded1.6.2.jar!/net/minecraft/server/MinecraftServer.class appears to be corrupt! There has been CRITICAL TAMPERING WITH MINECRAFT, it is highly unlikely minecraft will work! STOP NOW, get a clean copy and try again!

Client> 2013-07-09 08:23:38 [sEVERE] [ForgeModLoader] For your safety, FML will not launch minecraft. You will need to fetch a clean version of the minecraft jar file

Game ended with bad state (exit code 1)

Deleting C:\Users\Gray Family\AppData\Roaming\.minecraft\versions\Modded1.6.2\Modded1.6.2-natives-259489035032389

I have downloaded .776, .780, and .781 more than one time and installed them, but I get that message every time. Can anyone help me out here?

See my thread - you have a space in your user name and it'll be fixed soon.

 

(a work around is to create a new user - with no space).

 

 

So I have this problem because of my computer's name?

User name - not computer name    It's a windows thing.

 

But 784 fixed it - so give that a try 

 

 

 

I think we meant the same thing, but I just call the computer's name. Thanks anyway.

Actually, do you know what I do with my old mods? I can't play 1.6.2 with them in my folder. Do I just switch them in and out as I change versions?

If you want multiple versions of mods/sets use the profile's game dir option to set the place where mods will load.

the ./minecraft/mods folder is shared amung ALL profiles unless you specify otherwise, so there's no way to determine the difference