32 or 64 bit? (stupid question)

Hi to all, i have a question, probably more stupid: if i have operating system at 32 bit but with core duo 2 (cpu 64 bit) wich version can i download and install?

Sorry and thanks in advance.

You should install the version that matches your OS, in this case 32 bit. If you go to my computer/properties it should say “32 bit OS” under system, and nothing under Windows version.