have you put the c:/php;c:/php/exe into your path statement? (Obviously that is your installation drive and path.) As you have the browser window and it is not saying it cannot find the server, then we are assuming that iis is installed properly.
Hint: Download and unzip the PHP.zip file from Zend, NOT the .msi file, the zip is actually easier to install. ALSO, look for the PECL Win32 Binaries zip file, that contains some extra dll files that you may not otherwise have in the standard
Installation of PHP is really simple, unzip it to its own folder, and edit the path statement as above. You then need to edit the php.ini file and this is where is can all go pear shaped. For me, the less done the better, so take the php.ini-dist file and rename it to php.ini and then open it for edit. Look for Paths and Directories and edit these values to:
doc_root = "C:\inetpub\wwwroot\"
and
extention_dir = "C:/php/ext"
(or the same as your path statements).
You will also find the line
;cgi.force_redirect = 1
In IIS you MUST delete the semi colon and change the value to 0 so it reads:
cgi.force_redirect = 0
In IIS you may also neet to turn on FastCGI so uncomment the line and reset the value to 1:
fastcgi.impersonate = 1;
If you go to the Beginning Moodle 2.0 Administration, that will tell you what extensions you need to activate and a couple of other handy hints you can edit while in the php.ini file.
You also need to go to the Windows Registry and add
HKEY_LOCAL_MACHINE\SOFTWARE\PHP the key and value: "IniFilePath"="C:\\PHP"
Try the phpinfo.php file again and if it is working you can then move on. If not then you may need a couple of extra things.
You may need to download and copy the php5servlet.dll and php5activescript.dll into C:\PHP, but you do not not need them in the \ext folder. You do not need to activate these extensions, they are only used by specific programs so you can get away with them just being in the root of the PHP folder.
You may also need to activate the php-cgi.dll and php5asapi.dll files in IIS. Your IIS help file should tell you how to do that and why. Essentially, these dlls offer support for IIS in handling php requests, and I am not sure if they are additional or critical, so please look it up in the help file.
Good luck...