scripter50
i have two installations of vista/IIS7 working just fine within the latest public release of the php 5 code tree. so we can be sure that it "works" just fine.
we can help you if you provide us with precise error messages and descriptions of the steps you have taken to get where you are.
id also recommend installing php manually (using the zip file without installer) rather than trying to use the installer. it takes a little more time but, imo and ime, gives a better installation.