32 bit vs 64 bit

[gpshack2]

I did search some but did not find my answer. Is there any issues using a 64 bit system rather than a 32 bit system. I am trying to install a mapset on a PC that is 64 bit and connot get it done, using same files on a 32 bit and it is fine. I have split an image with Gmap and ran install on both systems using same img file to begin with but will not load on 64 bit. Gets to where it should complete the install and it stops and says "compiling preview map" , opens up gmaptool and has a file "mapset.mp", but does nothing, let it sit 20 mins. Has an error in log that says "wrong header"

Thanks