English Need Help

I get a blank page when trying to access setup.php

After I downloaded and unzipped the files, I tried to access the file yacs/setup.php and all I get is a blank page. No error messages.

I tried with other files and I still got nothing. I used both IE and Firefox. I'm using Apache in my computer. I'm able to run other PHP files, even if I save them in the yacs directory. Is there some setting or configuration issue that can cause this to happen? Please help.