Cannot Fix Internal Server Error 500

[wilxp]

My problems are as such.

First installation attempt:
-Got the error when i use the filemanager in ispcp on a remote machine.

Second installation attempt:
-Got the error when i uploaded postnuke CMS, but works fine when i upload Wordpress.
-Filemanager still got error

Third installation attempt:
-All php scripts seem to be in error.
-Filemanager still got error

I am using Ubuntu 8.10. I intend to do a complete removal and re-installation again. Any thing that i need to take note of?

When i do setup, do i choose the default "admin.{serverhost}" or simply use {serverhost}? Do i choose fcgi or fastcgi? Are they the same?

Thank you.