Forcing win32-loader to use i386?

Dear Lazyweb,

I'm happily using the win32-loader from to install Debian/Etch on several Lenovo X61s subnotebooks which don't have a DVD drive but a running XP preinstalled. The installer correctly detects a 64bit architecture and therefore installs AMD64. Unfortunately I want to run i386 on those machines. Is there a way to force a specific arch for the win32-loader?

Edit: Of course I already tried to install Debian from an USB stick on those machines, but the Debian installer refuses to work at the point where it's unable to find the DVD/CD drive on the subnotebooks without one. I've tried netinst and businesscard, none of them worked from USB for me. Any hints?