1. Update Java.
2. Playing with Wireless redstone and trying to push the limits of Minecraft is bad.
3. Already answered here: http://forum.feed-the-beast.com/threads/ftb-unleashed-1-1-3-restart-crash.29117/
Just go to your /WorldName/ folder, then delete /RedstoneEther/ folder.
It will reset your frequencies though, beware...