Before trying to install Icy Phoenix make sure you have the following STRICTLY NEEDED requirements:
At least 20 MB of free space in the folder you would like to install the package
Web server with PHP (4 or higher) installed and running (works best on Linux + Apache)
MySQL (3 or higher) database with at least 1MB of free space (of course the space needed depends on how big your site will be... 1MB is enough for a basic empty setup)
Ability to set CHMOD permissions
These other requirements (even if not strictly needed) are suggested for optimal performance of Icy Phoenix:
Webserver with .htaccess capability
Apache Rewrite Mod installed and running
GD Libraries (at least 2.0.28) installed and running
Register Globals set to OFF