Why won't my Minecraft Forge open?

I have had Minecraft for quite a long time, and have had Forge for a while too. Somewhat recently, I tried to open my 1.6.4 solo world and after the launcher closed, nothing happened. There was no error or crash or anything. The launcher just closed. No matter what I did, nothing worked. I took out all mods. I even completely uninstalled it and reinstalled it! It pulls up Vanilla Minecraft just fine, but not 1.6.4 forge. I also have the Technic launcher and any modpack in that that runs on 1.6.4 also doesn't open. The launcher just comes back up. I have looked everywhere on the internet for this, and nothing helped. How can I fix this?