My X9 QPW loads in 32-bit mode. Why?

Hi. I've been trying to load some old .wb3 files and my QPW keeps blowing out. I noticed, after firing up Windows Task Manager that it's running as 32 bit, but my computer's a 64 bit computer. How do I fix this?? Do I have to uninstall and reload X9? I just tried running setup again to "modify" my installation, but QPW still runs in 32 bit mode.
thanks
Steve