The Linux installer is not detecting your hard disk....
I infer that it is a SATA drive, but you don't actually say that---please confirm.
What is "linux enterprice edition (vertion 4)"?? Do you mean RedHat Enterprise 4? Since that is a bit old, it is quite possible that it does not have SATA drivers.
I have a SATA system at home, and MOST modern distros install without a hitch. A few do not.
Unless you have a specific reason to use Enterprise, I would recommend Fedora, Ubuntu, PCLinuxOS, etc.
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