32 and 64 bit

[erosenberg]

Dear List -
I am now trying to repoair my X-Window-less computer.  I now have a
64 bit Lenovo box on which I have loaded testing [enough tragedies
with unstable].  How do I safely move the files and executables from
the 32 bit system to the 64 bit system?  Which files/executables
should I leave as 32 bit.?
TIA
Ethan