Switching from 32 to 64 bit kernel

[Langdon Stevenson <langdon lindenrow com au>]

I recently built a Fedora 6.93 system with a 32 bit kernel.  Due to 
issues with the 32 bit Xen kernel I would like to test out the 64 Xen 
kernel.  However I have no idea if this will break things given that the 
system and all of the software that I have loaded are all 32 bit versions.

Can anyone tell me if this switch is possible?

Regards,
Langdon