You can use WinUAE (www.winuae.net) on Vista to emulate an
Amiga, and run Amiga games and programs on a PC. To make it work
properly, you will need to have some way to extract and transfer
the OS ROM from an actual Amiga. As with most forms of emulation,
downloading ROM images off the internet is illegal. However, the
Amiga Forever package by Cloanto (www.amigaforever.com) includes
several legal ROM files for different versions of the Amiga OS,
plus some extra software, and is pre-configured to get you started
right away. Their cheapest version runs US$30.