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Your java is out of date. Remove any existing java versions and install the latest x64 one from here.
Also for future reference do not bump your posts because you are no more important than anybody else and it was only 8 minutes since to orginally created the thread.
Installed the new java
if i want to launch a modpack ftb client closes down
this is the only thing that i can find
The FTB Launcher has found the following Java versions installed:
From Console: dec 17, 2013 9:26:35 PM java.util.prefs.WindowsPreferences <init>
WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5.