Jamie Rasmussen has made an AOLserver Windows binary available at
http://empoweringminds.mle.ie/openacs/index.html. While not the latest AOLserver version, it should be recent enough to allow you to test AOLserver/OpenACS on Windows.
Contact Jamie if you need help compiling a more recent version of AOLserver.
C.R., compilation instructions for AOLserver are also available from above link.
/Bart