Java lanceur 64 bits 1.5.2

Hello,

I just got my PC back and installed Java 7 in 64-bit (the 32-bit version coexists).

When I launch Minecraft, it starts with the 32-bit version, but I would like it to use the 64-bit version.
To do this, I went to the launcher, to "edit profile" and then changed the path in "executable".
The path was: C:\Program Files\Java\jre7\bin\javaw.exe
I assume this is the 32-bit version since it's in "Program Files (x86)".
So I wanted to set the following path: C:\Program Files\Java\jre7\bin\javaw.exe.
Which, I think, should correspond to the 64-bit version, but it doesn't work.

If anyone can help me, thank you in advance.