FTB Crashing after 5-10 min of gameplay

[Kukui]

This happens with all the modpacks I have tried so far (in the FTB Launcher). I have never had MC crash from the normal launcher, even if I mod it.

This crash happened while playing FTB Unleashed. If anyone could help that would be great.

Also i would just like to point out that I have been suggested to upgrade to 64bit OS. That can not happen. My friend runs MC with 1GB ram just fine, so I do not see how this is a memory problem.

Crash Report: http://pastebin.com/6VSeJaW0

 

[UniZero]

Follow the steps here first to install the launcher in the recommended way.

If you still have issues then go here for help obtaining and posting a log.