wordpress installation problem:file downloaded instead of displayed in browser

Hi,

I’m trying to install wordpress with nginx and php5-fpm on an ubuntu 10.04 server. I followed this configuration example but when I visit my URL, a file called “download” is downloaded; likewise, if I visit my-damain.com/wp-admin/install.php, and file “install.php” in downloaded not displayed.

The nginx is running and it can serve static html files, so I assume it’s a problem from php5-fpm, but can’t figure it out.

Has anyone experienced this before and found a solution?

Cheers