New a new desktop to run Adobe Audition 3. Help, please!

Are you aware that installation of Audition 3 is not quite as "easy" as it used to be??

Do you have the installer and, more importantly, the "special registration key/serial number" to activate it because the "old" activation system was decommissioned by Adobe several years ago? 

This isn't perhaps quite as simple as it might seem. Can you tell us exactly which Avalon preamp it is, and how it was/is connected to your Lenovo? I'm a little concerned about how you are going to digitise the preamp output.

The Dell will probably be fine - almost any computer around will cope with the physical rqueirements of Audition 3 but it's getting harder persuade it to play nicely with Microsoft's newer operating systems.