[deleted122510]

Hi & Welcome.

You can't "convert" A 64-bit OS to a 32-bit OS, same goes for your processor, etc. You're gonna have to fork out some moula and just get a new OS, A 32-bit OS at that.

 

[deleted122510]

I've dual booted both Vista & XP (and then later with 7), and it was very stable, no flaws, as long as you know how to dual-boot and partition your drives correctly, go for it.