I think I found a way to get the technic launcher and possibly stock Minecraft to use 64-bit instead of 32. I'll tell you what I did, I don't know if it might break anything else but java still seems to also work in Chrome at least.
I'm running Windows 7 pro.
I installed both 32- and 64-bit javas earlier.
I noticed Minecraft wasn't running in 64-bit java anymore.
I uninstalled Java version 7 update 4 32-bit from the computer.
I ran jarfix.exe from here http://johann.loefflmann.net/en/software/jarfix/index.html
I re-installed the 32-bit version of Java.
Now Minecraft/Technic is using 64-bit again for me.
I hope this helps someone, somewhere.