newbie question ARM and windows

From: sebastian (malaka_at_email.it)
Date: 06/28/04 

Date: 28 Jun 2004 07:55:59 -0700

hi,

i just saw that the new HP49G has an ARM running at 60MHz, and it got
me thinking that my first computer was a 40MHz 386DX with 4MB of RAM
and i remember i could run windows 3.1 on it. Does it means that i
could run windows on an ARM running at 60MHz (not on the calculator of
course)
could i build a computer with an ARM? (i think Acorn computers were
based on ARM) but i'd like to know if it'd be possible to build it
from scratch
thanks