First, calm down.
Second, this is the wrong section of the forum. Don't worry, though, it should be moved to http://www.minecraftforum.net/forums/support/modded-client-support shortly.
Third, launching it at different times isn't going to effect anything. If it doesn't work, it doesn't work.
Fourth, after this thread is moved, post the full crash log. Edit: In a spoiler.
Good luck with installing your mods!