snakkze

Could be the Mods you use when starting or the Forge version you are using. But to find out we need the crash-report from your start. You can find the crash-report at "C:\Users\YOURNAME\AppData\Roaming\.minecraft\crash-reports" usally. Then just find the latest crash-report and post it here/read it trough and find the error yourself. Edit: We need the debug.log not the crash-report...