I had the same problem, this is from shaffer on another forum.
jl_cmder and vista64 bit users READ!
Okay, myself like all of you who are trying to use jl_cmder and vista 64 bit may run into issues with CHOICE.EXE saying something about 16bit no supported and what not.
I have a 32bit version (which works with a 64 bit OS) which i will attach for all of you. Simply delete the 16bit version out of the directory and replace it with the 32 bit found on this thread, run jl_cmder and voila! No error.
I have confirmed this works, as I just did it successfully on mine. Do not run jl_cmder as admin, set compatibility to xp sp2 and it should work.
1. Download jl_cmder from JL_Cmder Javaloader Utility Non Installer
2. Extract contents
3. Download MY version
4. Replace CHOICE with the my version of the file.
5. Right click JL_Cmder.cmd and choose properties
6. Click compatibility tab and check Run this program in compatibility mode for: Windows XP (Service Pack 2)
7. Click OK
8. Run JL_Cmder.cmd
This did the trick for me. Got it running. Thanks Shane