Upgrade Problem found [no longer 64bit]

I am facing a problem with my system after i have upgraded from 4.38 to 5.12. the problem is that my system went from 64bit system to 32bit system and now my 4gig of RAM is only seen as 3 gig..

any ideas how i can fix this without re-installing the entire system and keeping my working config?

$ uname -m
i686
$ lscpu
Architecture: i686
CPU op-mode(s): 64-bit
CPU(s): 1
Vendor ID: AuthenticAMD
CPU family: 16
Model: 6
Stepping: 3
CPU MHz: 800.000
Virtualization: AMD-V
L1d cache: 64K
L1i cache: 64K
L2 cache: 1024K

$ uname -a
Linux OMVServer 2.6.32-5-486 #1 Mon Sep 23 22:27:36 UTC 2013 i686 GNU/Linux

Not sure if i mistakenly installed the 32bit :cry: but i am sure i was able to get 4 gig of ram to come up with omv...

in any case, any way to go from a 32bit to 64bit without any damage :cry:

thanks, i will give it a try and hopefully i won't lose my data..