bit

Hi Forumers, LUGUY here. My computer has 4.00 of RAM, After I reformatted my Win7 Pro 64 bit to Win 7 32 bit I have only 2.75 GB Usable Memoty RAM in Computer- Properties, but in DRIVE C- Properties appear 432 GB of FREE space of 465 GB of Capacity , why this happen? or if this is normal? Thank...