To take full advantage of Open-AudIT on a Windows machine, you will need Nmap installed.
Nmap is available for Windows, here - https://nmap.org/download.html.
More information about Open-AudIT and Nmap is available here - Open-AudIT and Nmap.
All other dependencies are packaged with the Open-AudIT download.
Open-AudIT should be installed on 64bit systems only. You might try it on a 32bit system, but this will not be supported going forward.