I have the EXACT same problem.
I have tried it on 3 different machines, two running Windows XP Pro sp2 and one running Windows 2003.
I always get the exact same thing.
I get the strange input feilds already filled in, after filling them out correctly and hitting 'install' it just refreshes the same page, erasing what I entered and replacing it with the strings.
I have also tried using WAMPServer and EasyPHP, as well as installing the services manually. (on 3 separate machines)
any ideas?
-Bill