Being MSDN I could have installed any version I wanted but having looked at the extras I considered HP adequate.
I didn't consider I needed XP Mode via virtualisation, nor bitlocker, nor backing up to a network.
I've actually installed, and have working, without compatibility, quite a few programs that the upgrade advisor reckoned wouldn't work
Microsoft Digital Image 2006
Paintshop Pro Photo X1
Canon CD LabelPrint
Nero 7 Premium