This error (normally) means could not find the file!
I assume you right clicked on My Computer and selected Manage.
Go to - Internet Information Services, Web Site.
Right click on Web Site and select New Virtual Directory.. Give it a name. Browse to the folder the file is in. Select the folder..
Right click on the file you want to view. it should now work.
Note you have to follow the setup text in: Apache\Php\Install.txt.. the bit starting: IIS 4.0+ section (CGI) section 5.
You should be able to view the file if you drag it into the "Web Site" while in Computer Manager.