Can everyone help me?, pease...

I´m new on PHP, I´ve been trying to make an easy program: <html> <body> <?php $texto="Hello World"; echo $texto; ?> <br> <b>My first Script on PHP</b> </body> </html> When I try to run the program from the Internet explorer, it doesn´t show "Hello World", just display "My first script on PHP". I belive that PHP is not working, I do not why, so It only shows the label on HTML "My first script on PHP". I´m working with Win. Nt 4.0 Server, and IIS. I install PHP Ver. 4.05. Can you help me please?, let me know what can I do, I have not idea of what to do. I have some more questions: When you install the PHP on your machine you can see it from the control panel? How can I see if it is install well? How I can prove it? Yessbell Carranza SISTEMAS ORION