I've done this before to my minecraft but all of the sudden installing forge will simply result in an error message after the mojang screen. I've read up on tutorials but to no avail.Why is this happening? And in case it matters, whenever it says 'forge mod loader loading' the bar doesn't move but it still validates and it launches.
Sorry if this belongs in the modded forum, but I suddenly can't install forge on my (currently)unmodded minecraft.