JAVA VM problem on 64 bit deployed application

My application (a compiled and redistributed application using matlab R2008a) works properly in 32bit. It is a GUI application and does not work in the 64bit compiled version. More precisely, the .exe generated in the development machine works ( located by default in the \distrib folder ), the deployed version installed in THE SAME MACHINE (which is a WIN 7 64bit o.s.) does not work. The program starts but the GUI never appears before the program crashes.

1. An unexpected error has been detected by Java Runtime Environment:#
2. EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00000000774908c5, pid=13208, tid=13216#
3. Java VM: Java HotSpot™ 64-Bit Server VM (11.2-b01 mixed mode windows-amd64)
4. Problematic frame:
5. C [ntdll.dll+0x508c5]

followed by a bunch of messages.

We tried many JAVA versions from 5.0.220.3 to 6.0.240.7 (and the default 6.0.0.105). All work in the /distrib and all do not work in the deployed path (\Program Files\). Tried also a different deployed path (\My Documents\), but nothing changes.

Anyone have any ideas?