They said Atari 8-bit...not ST.
Best Atari 8-bit emu for Win32 is Atari800Win, a port of Atari800, which is the emu for DOS :)
Check the Atari 8-bit (or XL/XE) emulator section on http://www.vintagegaming.com
Later,
The Joystick Lunatic
EFNet IRC nick: JLsoft