PHP erratic on Win2k Server

I am running Win2k server, IIS 5 and PHP 4.06. I can always load hello.htm and hello.asp from any location, but from some locations/ISP's I cannot load any php pages. Two things I think I may need to do: 1.) register a MIME type for php. I already have the web site configured to use .php files and execute c:\php\php.exe %s %s 2.) edit the script map key in the registry and put .php and path to the CGI exe Anyone else have any ideas why my site might not work. btw, try my site @ http://www.askthesmartass.com Thanks in advance, Brian