Pixiestic

I'm in need of help getting minecraft to work with forge. I use Multi MC, old instances of games on my laptop work just fine, but when loading up a new instance on my tower, I get the Fatal Error starting up minecraft and FML. I have read through the log, and manually downloaded and installed the missing files to no avail. I have attempted this in both Multi MC and MagicLauncher. (also in the MC Launcher, but still dont understand the file system completely.) Thanks for any help.