What DirectX Version ar you running?
I'm using a 8y old grafic card and run 32bit and 64bit of the Game with no problem. And are you realy need 32bit is your System that old or is it the OS that is stuck on that?
DirectX 9.0c (4.09.0000.0904)
Have you checked for updated drivers for your video card?
yup i must upgrade the OS to win sp3 or win 7
So you are running win6 aka Vista, an what graphics card are you using? dx9 is well really old and i have no acces to hardware in my shop under dx11.
win xp sp2 dx9 all updated Geforce 7025 / nividia nforce 630a version 6.14.0013.0790
Ok, XP thats old. well these Hardeware i do have that old somwhere with DX9 Support but building up a PC for that is a bit to much. x'D
I think just that old OS is your Problem for that Unity Game. My the Dev's be with you.^^
