64-bit?

[Ryan Coleman]

I'm full of questions, I know... And I haven't been googling well lately 
but there seem to be a lot of you with a lot of knowledge and you're 
willing to share (as am I).

This machine is running a D2C E4600 which (as I understand) is a 64-bit 
cpu, but I'm running fBSD 6.3 which is *not* 64-bit? Might this have 
anything to do with the crashes? Is there a stable 64-bit version of 
fBSD I should install? Will it upgrade the 32-bit or should I go from 
scratch?