64bit and 32bit

I want to install 32bit operating system in a computer because threre is only 4gb ram and 32bit os performs very smooth. But, while downloading the necessary driver from that 'motherboard website' , I noticed that there is no 32bit vga driver in the website. Question: If I download that 64bit...

I remember reading a while ago about how Program Files was for 64bit Software/Programs, while Program Files (x86) is for 32bit. So my question is, installing relatively modern(past few years) & modern games be affected in any way depending on their instillation location? Cheers! :)

so i bought two 2gb stick of 800mhz ram for my computer but every time i try to boot into windows 10 or 7 64bit the cpu stays at 100% usage making it unusable,but when i boot into windows 32bit it works normally but only usase 3.5gb of ram and when i boot into windows 64bit with only 3gb of ram...