dig into the thread on the 4700 update to Wm5. Many went back to 03SE.
There is a USB boot mode that doesnt require Activestink. Did you also try a clean reset? (also documented in that thread).
http://www.pocketpcthoughts.com/foru...c.php?p=394438
People there had lockups and other problems, I'm sure if you contact some of them they can help.
Call HP, I'm sure they will setup you being able to download the CD - as long as you have proof of purchase, which you have since you bought the CD (they'll have it on record).