Yesterday, I was trying to use a mod and I got on Youtube to see how to download and install the mod. I apparently kept doing something wrong because I could get a map to work but not the mod. Even though the mod wouldn`t work, I could still use the map and normal gameplay. When I launched Minecraft today, the game screen blacked out and a pop-up saying, 'FML is setting up your minecraft environment. Please wait, FML has some tasks to do before you can play. Found library file scala_library.jar present and correct in the lib dir' Then it has a loading bar that won`t move from 0%. I think I messed up on either the .jar entries or the Forge download. When I went back to the minecraft.jar, I deleted the DCIM folder (or whatever it`s called) and tried to relaunch Minecraft. It gave me the same pop-up, but this time with another on top of it that said, 'There was a fatal error starting up minecraft and FML. Minecraft cannot launch in its current configuration and telling me to consult the file C:files\Users\(My user)\AppData\Roaming\.minecraft\ForgeModLoader-client-0.log. I got to the file but it won`t open because it is a LCK File.
Would I have to get a new minecraft.jar? If so, how?