New
#41
You should mention (as a "Pro") better security for a 64-bit OS.
Reasons? A 32-bit virus cannot infect 64-bit system files or 64-bit processes. It doesn't make you completely immune from viruses/malware but it is a LOT better than 32-bit Windows in regards to security. See link below for some proof.
http://www.windowsecurity.com/articl...re-Secure.html