Sh4d0w11

I have tried this multiple times before and with no luck

Launcher Version: launcher build:342 Operating System: windows 8 Java Version: very latest Antivirus Program: Norton Description of Problem: my Technic launcher is working fine but when i try to click on the hexxit mod pack or a few other ones, 0% pops up as if it is loading, then quickly disappears. It was working as of yesterday and now just refuses to. Please help! Error Messages: Error Log: