Dear Sirs

I am new In Red Hat. I have "Red Hat Enterprise Linux Ws 2.6.9.5 Elsmsp 2.6". First I buy the package and I try to install in my desktop, the Red Hat did not install. In that time I have right to support I speak with them, and they told me to download the last version and install. After I download the Red Hat it installed himself. They told me that first I have a hold version that did not recognise the hardware and the new recognise it. Now I buy an Hp Pavillion Zd 8000 and I have the same problem the version who I have does not install.
I would to know what the problem is and how I could solve the problem?
Is the version of Red Hat does not recognise the hardware and if is, where I can find a new version that is recognise?

regards

Boot : linux nofb