installation with IIS

["John" <chamberlayne@xxxxxxxxxxx>]

I have installed php installer 5.2.6 on Windows Vista with IIS running.
I wrote "hello.php" with notebook, and put it in the IIS home page 
(C:\inetpub\wwwroot).
If I try to run http://localhost/hello.php (or any other .php file) in IE it 
gives me error 404 - page not found.
Running it in Firefox asks me if I want to run hello.php with cli, or to 
save it to disk.   So it finds the file OK, but does not change it to the 
http file, and display it.  If I choose run with cli, it gives an error 
message "CLI has stopped working".
Can anyone  advise?
Thanks
John